diff --git a/app/assets/javascripts/app/controllers/_application_controller_generic.coffee b/app/assets/javascripts/app/controllers/_application_controller_generic.coffee
index d2f1f8df8..553a7df9d 100644
--- a/app/assets/javascripts/app/controllers/_application_controller_generic.coffee
+++ b/app/assets/javascripts/app/controllers/_application_controller_generic.coffee
@@ -95,8 +95,8 @@ class App.ControllerGenericEdit extends App.ControllerModal
 class App.ControllerGenericIndex extends App.Controller
   events:
     'click [data-type=edit]': 'edit'
-    'click [data-type=new]':  'new'
-    'click .js-description':  'description'
+    'click [data-type=new]': 'new'
+    'click .js-description': 'description'
 
   constructor: ->
     super
@@ -621,10 +621,10 @@ class App.ActionRow extends App.Controller
     for item in @items
       do (item) =>
         @$('[data-type="' + item.name + '"]').on(
-          'click',
-          (e) ->
+          'click'
+          (e) =>
             e.preventDefault()
-            item.callback()
+            item.callback(@el)
         )
 
 class App.Sidebar extends App.Controller
@@ -657,24 +657,25 @@ class App.Sidebar extends App.Controller
     @toggleTabAction(name)
 
   render: =>
-    @html App.view('generic/sidebar_tabs')
+    localEl = $(App.view('generic/sidebar_tabs')(
       items: @items
       scrollbarWidth: App.Utils.getScrollBarWidth()
+    ))
 
     # init content callback
     for item in @items
+      area = localEl.filter('.sidebar[data-tab="' + item.name + '"]')
       if item.callback
-        item.callback( @$( '.sidebar[data-tab="' + item.name + '"] .sidebar-content' ) )
-
-    # add item acctions
-    for item in @items
+        item.callback( area.find('.sidebar-content') )
       if item.actions
         new App.ActionRow(
-          el:    @$('.sidebar[data-tab="' + item.name + '"] .js-actions')
+          el:    area.find('.js-actions')
           items: item.actions
           type:  'small'
         )
 
+    @html localEl
+
   toggleDropdown: (e) ->
     e.stopPropagation()
     $(e.currentTarget).next('.js-actions').find('.dropdown-toggle').dropdown('toggle')
diff --git a/app/assets/javascripts/app/controllers/ticket_zoom.coffee b/app/assets/javascripts/app/controllers/ticket_zoom.coffee
index e196d002e..ad3ddaf15 100644
--- a/app/assets/javascripts/app/controllers/ticket_zoom.coffee
+++ b/app/assets/javascripts/app/controllers/ticket_zoom.coffee
@@ -486,14 +486,10 @@ class App.TicketZoom extends App.Controller
       )
 
     if @sidebar
-
-      # update tags
-      if @sidebar.tagWidget
-        @sidebar.tagWidget.reload(@tags)
-
-      # update links
-      if @sidebar.linkWidget
-        @sidebar.linkWidget.reload(@links)
+      @sidebar.reload(
+        tags: @tags
+        links: @links
+      )
 
     if !@initDone
       if @article_id
@@ -681,12 +677,12 @@ class App.TicketZoom extends App.Controller
       callback:
         tagAdd: (tag) =>
           return if !@sidebar
-          return if !@sidebar.tagWidget
-          @sidebar.tagWidget.add(tag)
+          return if !@sidebar.reload
+          @sidebar.reload(tagAdd: tag)
         tagRemove: (tag) =>
           return if !@sidebar
-          return if !@sidebar.tagWidget
-          @sidebar.tagWidget.remove(tag)
+          return if !@sidebar.reload
+          @sidebar.reload(tagRemove: tag)
     )
 
     # set defaults
diff --git a/app/assets/javascripts/app/controllers/ticket_zoom/sidebar.coffee b/app/assets/javascripts/app/controllers/ticket_zoom/sidebar.coffee
index 2dd77dcb2..874922998 100644
--- a/app/assets/javascripts/app/controllers/ticket_zoom/sidebar.coffee
+++ b/app/assets/javascripts/app/controllers/ticket_zoom/sidebar.coffee
@@ -1,182 +1,30 @@
-class Edit extends App.ObserverController
-  model: 'Ticket'
-  observeNot:
-    created_at: true
-    updated_at: true
-  globalRerender: false
-
-  render: (ticket, diff) =>
-    defaults = ticket.attributes()
-    delete defaults.article # ignore article infos
-    taskState = @taskGet('ticket')
-
-    if !_.isEmpty(taskState)
-      defaults = _.extend(defaults, taskState)
-
-    new App.ControllerForm(
-      elReplace: @el
-      model:     App.Ticket
-      screen:    'edit'
-      handlers:  [
-        @ticketFormChanges
-      ]
-      filter:    @formMeta.filter
-      params:    defaults
-      #bookmarkable: true
-    )
-
-    @markForm(true)
-
-    return if @resetBind
-    @resetBind = true
-    @bind('ui::ticket::taskReset', (data) =>
-      return if data.ticket_id.toString() isnt ticket.id.toString()
-      @render(ticket)
-    )
-
 class App.TicketZoomSidebar extends App.ObserverController
   model: 'Ticket'
   observe:
     customer_id: true
     organization_id: true
 
+  reload: (args) =>
+    for key, backend of @sidebarBackends
+      if backend && backend.reload
+        backend.reload(args)
+
   render: (ticket) =>
-    editTicket = (el) =>
-      el.append(App.view('ticket_zoom/sidebar_ticket')())
-
-      @edit = new Edit(
-        object_id: ticket.id
-        el:        el.find('.edit')
-        taskGet:   @taskGet
-        formMeta:  @formMeta
-        markForm:  @markForm
+    @sidebarBackends = {}
+    @sidebarItems = []
+    sidebarBackends = App.Config.get('TicketZoomSidebar')
+    keys = _.keys(sidebarBackends).sort()
+    for key in keys
+      @sidebarBackends[key] = new sidebarBackends[key](
+        ticket:   ticket
+        taskGet:  @taskGet
+        formMeta: @formMeta
+        markForm: @markForm
       )
+      item = @sidebarBackends[key].sidebarItem()
+      if item
+        @sidebarItems.push item
 
-      if @permissionCheck('ticket.agent')
-        @tagWidget = new App.WidgetTag(
-          el:          @el.find('.tags')
-          object_type: 'Ticket'
-          object:      ticket
-          tags:        @tags
-        )
-        @linkWidget = new App.WidgetLink(
-          el:          @el.find('.links')
-          object_type: 'Ticket'
-          object:      ticket
-          links:       @links
-        )
-
-        @timeUnitWidget = new App.TicketZoomTimeUnit(
-          el:        @el.find('.js-timeUnit')
-          object_id: ticket.id
-        )
-
-    showTicketHistory = =>
-      new App.TicketHistory(
-        ticket_id: ticket.id
-        container: @el.closest('.content')
-      )
-    showTicketMerge = =>
-      new App.TicketMerge(
-        ticket:    ticket
-        task_key:  @task_key
-        container: @el.closest('.content')
-      )
-    changeCustomer = (e, el) =>
-      new App.TicketCustomer(
-        ticket_id: ticket.id
-        container: @el.closest('.content')
-      )
-    @sidebarItems = [
-      {
-        head:     'Ticket'
-        name:     'ticket'
-        icon:     'message'
-        callback: editTicket
-      }
-    ]
-    if @permissionCheck('ticket.agent')
-      @sidebarItems[0]['actions'] = [
-        {
-          name:     'ticket-history'
-          title:    'History'
-          callback: showTicketHistory
-        },
-        {
-          name:     'ticket-merge'
-          title:    'Merge'
-          callback: showTicketMerge
-        },
-        {
-          title:    'Change Customer'
-          name:     'customer-change'
-          callback: changeCustomer
-        },
-      ]
-    if @permissionCheck('ticket.agent')
-      editCustomer = (e, el) =>
-        new App.ControllerGenericEdit(
-          id: ticket.customer_id
-          genericObject: 'User'
-          screen: 'edit'
-          pageData:
-            title:   'Users'
-            object:  'User'
-            objects: 'Users'
-          container: @el.closest('.content')
-        )
-      showCustomer = (el) ->
-        new App.WidgetUser(
-          el:       el
-          user_id:  ticket.customer_id
-        )
-      @sidebarItems.push {
-        head:    'Customer'
-        name:    'customer'
-        icon:    'person'
-        actions: [
-          {
-            title:    'Change Customer'
-            name:     'customer-change'
-            callback: changeCustomer
-          },
-          {
-            title:    'Edit Customer'
-            name:     'customer-edit'
-            callback: editCustomer
-          },
-        ]
-        callback: showCustomer
-      }
-      if ticket.organization_id
-        editOrganization = (e, el) =>
-          new App.ControllerGenericEdit(
-            id: ticket.organization_id,
-            genericObject: 'Organization'
-            pageData:
-              title:   'Organizations'
-              object:  'Organization'
-              objects: 'Organizations'
-            container: @el.closest('.content')
-          )
-        showOrganization = (el) ->
-          new App.WidgetOrganization(
-            el:              el
-            organization_id: ticket.organization_id
-          )
-        @sidebarItems.push {
-          head: 'Organization'
-          name: 'organization'
-          icon: 'group'
-          actions: [
-            {
-              title:    'Edit Organization'
-              name:     'organization-edit'
-              callback: editOrganization
-            },
-          ]
-          callback: showOrganization
-        }
     new App.Sidebar(
       el:           @el.find('.tabsSidebar')
       sidebarState: @sidebarState
diff --git a/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_customer.coffee b/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_customer.coffee
new file mode 100644
index 000000000..701a151b6
--- /dev/null
+++ b/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_customer.coffee
@@ -0,0 +1,48 @@
+class SidebarCustomer extends App.Controller
+  sidebarItem: =>
+    return if !@permissionCheck('ticket.agent')
+    {
+      head:    'Customer'
+      name:    'customer'
+      icon:    'person'
+      actions: [
+        {
+          title:    'Change Customer'
+          name:     'customer-change'
+          callback: @changeCustomer
+        },
+        {
+          title:    'Edit Customer'
+          name:     'customer-edit'
+          callback: @editCustomer
+        },
+      ]
+      callback: @showCustomer
+    }
+
+  showCustomer: (el) =>
+    @el = el
+    new App.WidgetUser(
+      el:       @el
+      user_id:  @ticket.customer_id
+    )
+
+  editCustomer: =>
+    new App.ControllerGenericEdit(
+      id: @ticket.customer_id
+      genericObject: 'User'
+      screen: 'edit'
+      pageData:
+        title:   'Users'
+        object:  'User'
+        objects: 'Users'
+      container: @el.closest('.content')
+    )
+
+  changeCustomer: =>
+    new App.TicketCustomer(
+      ticket_id: @ticket.id
+      container: @el.closest('.content')
+    )
+
+App.Config.set('200-Customer', SidebarCustomer, 'TicketZoomSidebar')
diff --git a/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_organization.coffee b/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_organization.coffee
new file mode 100644
index 000000000..ad612da6b
--- /dev/null
+++ b/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_organization.coffee
@@ -0,0 +1,36 @@
+class SidebarOrganization extends App.Controller
+  sidebarItem: =>
+    return if !@ticket.organization_id
+    {
+      head: 'Organization'
+      name: 'organization'
+      icon: 'group'
+      actions: [
+        {
+          title:    'Edit Organization'
+          name:     'organization-edit'
+          callback: @editOrganization
+        },
+      ]
+      callback: @showOrganization
+    }
+
+  showOrganization: (el) =>
+    @el = el
+    new App.WidgetOrganization(
+      el:              @el
+      organization_id: @ticket.organization_id
+    )
+
+  editOrganization: =>
+    new App.ControllerGenericEdit(
+      id: @ticket.organization_id,
+      genericObject: 'Organization'
+      pageData:
+        title:   'Organizations'
+        object:  'Organization'
+        objects: 'Organizations'
+      container: @el.closest('.content')
+    )
+
+App.Config.set('300-Organization', SidebarOrganization, 'TicketZoomSidebar')
diff --git a/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_ticket.coffee b/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_ticket.coffee
new file mode 100644
index 000000000..52ea11299
--- /dev/null
+++ b/app/assets/javascripts/app/controllers/ticket_zoom/sidebar_ticket.coffee
@@ -0,0 +1,130 @@
+class Edit extends App.ObserverController
+  model: 'Ticket'
+  observeNot:
+    created_at: true
+    updated_at: true
+  globalRerender: false
+
+  render: (ticket, diff) =>
+    defaults = ticket.attributes()
+    delete defaults.article # ignore article infos
+    taskState = @taskGet('ticket')
+
+    if !_.isEmpty(taskState)
+      defaults = _.extend(defaults, taskState)
+
+    new App.ControllerForm(
+      elReplace: @el
+      model:     App.Ticket
+      screen:    'edit'
+      handlers:  [
+        @ticketFormChanges
+      ]
+      filter:    @formMeta.filter
+      params:    defaults
+      #bookmarkable: true
+    )
+
+    @markForm(true)
+
+    return if @resetBind
+    @resetBind = true
+    @bind('ui::ticket::taskReset', (data) =>
+      return if data.ticket_id.toString() isnt ticket.id.toString()
+      @render(ticket)
+    )
+
+class SidebarTicket extends App.Controller
+  sidebarItem: =>
+    sidebarItem = {
+      head:     'Ticket'
+      name:     'ticket'
+      icon:     'message'
+      callback: @editTicket
+    }
+    if @permissionCheck('ticket.agent')
+      sidebarItem['actions'] = [
+        {
+          title:    'History'
+          name:     'ticket-history'
+          callback: @showTicketHistory
+        },
+        {
+          title:    'Merge'
+          name:     'ticket-merge'
+          callback: @showTicketMerge
+        },
+        {
+          title:    'Change Customer'
+          name:     'customer-change'
+          callback: @changeCustomer
+        },
+      ]
+    sidebarItem
+
+  reload: (args) =>
+
+    # apply tag changes
+    if @tagWidget
+      if args.tags
+        @tagWidget.reload(args.tags)
+      if args.tagAdd
+        @tagWidget.add(args.tagAdd)
+      if args.tagRemove
+        @tagWidget.remove(args.tagRemove)
+
+    # apply link changes
+    if @linkWidget && args.links
+      @linkWidget.reload(args.links)
+
+  editTicket: (el) =>
+    @el = el
+    localEl = $( App.view('ticket_zoom/sidebar_ticket')() )
+
+    @edit = new Edit(
+      object_id: @ticket.id
+      el:        localEl.find('.edit')
+      taskGet:   @taskGet
+      formMeta:  @formMeta
+      markForm:  @markForm
+    )
+
+    if @permissionCheck('ticket.agent')
+      @tagWidget = new App.WidgetTag(
+        el:          localEl.filter('.tags')
+        object_type: 'Ticket'
+        object:      @ticket
+        tags:        @tags
+      )
+      @linkWidget = new App.WidgetLink(
+        el:          localEl.filter('.links')
+        object_type: 'Ticket'
+        object:      @ticket
+        links:       @links
+      )
+      @timeUnitWidget = new App.TicketZoomTimeUnit(
+        el:        localEl.filter('.js-timeUnit')
+        object_id: @ticket.id
+      )
+    @html localEl
+
+  showTicketHistory: =>
+    new App.TicketHistory(
+      ticket_id: @ticket.id
+      container: @el.closest('.content')
+    )
+
+  showTicketMerge: =>
+    new App.TicketMerge(
+      ticket:    @ticket
+      task_key:  @task_key
+      container: @el.closest('.content')
+    )
+
+  changeCustomer: =>
+    new App.TicketCustomer(
+      ticket_id: @ticket.id
+      container: @el.closest('.content')
+    )
+
+App.Config.set('100-TicketEdit', SidebarTicket, 'TicketZoomSidebar')
diff --git a/app/assets/javascripts/app/controllers/widget/link.coffee b/app/assets/javascripts/app/controllers/widget/link.coffee
index e7bbb9f90..98a45b1af 100644
--- a/app/assets/javascripts/app/controllers/widget/link.coffee
+++ b/app/assets/javascripts/app/controllers/widget/link.coffee
@@ -185,4 +185,14 @@ class App.LinkAdd extends App.ControllerModal
       success: (data, status, xhr) =>
         @close()
         @parent.fetch()
+      error: (xhr, statusText, error) =>
+        detailsRaw = xhr.responseText
+        details = {}
+        if !_.isEmpty(detailsRaw)
+          details = JSON.parse(detailsRaw)
+        @notify(
+          type:      'error'
+          msg:       App.i18n.translateContent(details.error)
+          removeAll: true
+        )
     )
diff --git a/app/assets/javascripts/app/controllers/widget/tag.coffee b/app/assets/javascripts/app/controllers/widget/tag.coffee
index 774e62eaa..f148746fa 100644
--- a/app/assets/javascripts/app/controllers/widget/tag.coffee
+++ b/app/assets/javascripts/app/controllers/widget/tag.coffee
@@ -53,9 +53,8 @@ class App.WidgetTag extends App.Controller
     @html App.view('widget/tag')(
       tags: @localTags || [],
     )
-
     source = "#{App.Config.get('api_path')}/tag_search"
-    @el.find('.js-newTagInput').autocomplete(
+    @$('.js-newTagInput').autocomplete(
       source: source
       minLength: 2
       response: (e, ui) =>
diff --git a/app/assets/javascripts/app/views/generic/sidebar_tabs.jst.eco b/app/assets/javascripts/app/views/generic/sidebar_tabs.jst.eco
index cadc8e0ce..30a3ada73 100644
--- a/app/assets/javascripts/app/views/generic/sidebar_tabs.jst.eco
+++ b/app/assets/javascripts/app/views/generic/sidebar_tabs.jst.eco
@@ -1,16 +1,14 @@
 <% for item in @items: %>
 <div class="sidebar bottom-form-shadow flex hide" data-tab="<%= item.name %>">
   <div class="sidebar-header">
-    <h2 class="sidebar-header-headline js-headline"><%- @T( item.head ) %></h2>
+    <h2 class="sidebar-header-headline js-headline"><%- @T(item.head) %></h2>
     <div class="sidebar-header-actions js-actions"></div>
     <div class="tabsSidebar-close">
       <%- @Icon('long-arrow-right') %>
     </div>
   </div>
   <hr>
-
   <div class="sidebar-content"></div>
-
 </div>
 <% end %>
 <div class="tabsSidebar-tabs" style="margin-left: -<%- @scrollbarWidth %>px">
diff --git a/app/controllers/links_controller.rb b/app/controllers/links_controller.rb
index 35904dba5..929e21eb4 100644
--- a/app/controllers/links_controller.rb
+++ b/app/controllers/links_controller.rb
@@ -15,7 +15,7 @@ class LinksController < ApplicationController
     links.each { |item|
       link_list.push item
       if item['link_object'] == 'Ticket'
-        ticket = Ticket.lookup( id: item['link_object_value'] )
+        ticket = Ticket.lookup(id: item['link_object_value'])
         assets = ticket.assets(assets)
       end
     }
@@ -30,14 +30,18 @@ class LinksController < ApplicationController
   # POST /api/v1/links/add
   def add
 
-    # lookup object id
-    object_id = Ticket.where( number: params[:link_object_source_number] ).first.id
+    object = Ticket.find_by(number: params[:link_object_source_number])
+    if !object
+      render json: { error: 'No such object!' }, status: :unprocessable_entity
+      return
+    end
+
     link = Link.add(
       link_type: params[:link_type],
       link_object_target: params[:link_object_target],
       link_object_target_value: params[:link_object_target_value],
       link_object_source: params[:link_object_source],
-      link_object_source_value: object_id
+      link_object_source_value: object.id,
     )
 
     if link