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Events

This article lists the events specific for the RadTabControl control.

  • PreviewTabClosed: Occurs when a RadTabItem is about to be closed. The event arguments are of type PreviewTabChangedEventArgs and provide access to the following properties:

    • TabItem: The RadTabItem that has been changed.

    • DataContext: The DataContext of the changed RadTabItem.

      Example 1: PreviewTabClosed Event Handler

              private void TabControl_PreviewTabClosed(object sender, Telerik.Windows.Controls.PreviewTabChangedEventArgs e) 
              { 
                  if (e.TabItem.Header.ToString() == "Tab 1") 
                  { 
                      e.Cancel = true; 
                  } 
              } 
      
              Private Sub TabControl_PreviewTabClosed(ByVal sender As Object, ByVal e As Telerik.Windows.Controls.PreviewTabChangedEventArgs) 
                  If e.TabItem.Header.ToString() = "Tab 1" Then 
                      e.Cancel = True 
                  End If 
              End Sub 
      
  • TabClosed: Occurs when a RadTabItem is closed. The event arguments are of type TabChangedEventArgs and expose the following members:

    • TabItem: The RadTabItem that has been changed.

    • DataContext: The DataContext of the changed TabItem.

  • PreviewTabUnpinned: Occurs when a RadTabItem is about to be unpinned. Event arguments are of of type PreviewTabChangedEventArgs.

    Example 2: PreviewTabUnpinned Event Handler

        private void RadTabControl_PreviewTabUnpinned(object sender, Telerik.Windows.Controls.PreviewTabChangedEventArgs e) 
        { 
            MessageBox.Show($"{e.TabItem.Header} is about to be unpinned."); 
        } 
    
        Private Sub RadTabControl_PreviewTabUnpinned(ByVal sender As Object, ByVal e As Telerik.Windows.Controls.PreviewTabChangedEventArgs) 
            MessageBox.Show($"{e.TabItem.Header} is about to be unpinned.") 
        End Sub 
    
  • TabUnpinned: Occurs when a RadTabItem is unpinned. The event arguments are of type TabChangedEventArgs.

  • PreviewTabPinned: Occurs when a RadTabItem is about to be pinned. The event arguments are of type PreviewTabChangedEventArgs.

    Example 3: PreviewTabPinned Event Handler

        private void RadTabControl_PreviewTabPinned(object sender, Telerik.Windows.Controls.PreviewTabChangedEventArgs e) 
        { 
            e.Cancel = true; 
        } 
    
        Private Sub RadTabControl_PreviewTabPinned(ByVal sender As Object, ByVal e As Telerik.Windows.Controls.PreviewTabChangedEventArgs) 
            e.Cancel = True 
        End Sub 
    
  • TabPinned: Occurs when a RadTabItem is pinned. The event arguments are of type TabChangedEventArgs.

  • DropDownOpened: An event that is raised when the Telerik.Windows.Controls.TabControl.DropDownMenu is opened. This is a RoutedEvent. The event arguments are of type DropDownEventArgs and expose the following members:

    • DropDownItemsSource: Gets or sets the items collection for the drop down context menu.

    • RoutedEvent: Gets or sets the RoutedEventAgs.RoutedEvent associated with this RoutedEventArgs instance.

      Example 4: DropDownOpened Routed Event

              private void RadTabControl_DropDownOpened(object sender, DropDownEventArgs e) 
              { 
                  List<string> dropDownItems = e.DropDownItemsSource.Cast<string>().ToList<string>(); 
                  dropDownItems.Add("New DropDown Item."); 
                  e.DropDownItemsSource = dropDownItems; 
              } 
      
              Private Sub RadTabControl_DropDownOpened(ByVal sender As Object, ByVal e As DropDownEventArgs) 
                  Dim dropDownItems As List(Of String) = e.DropDownItemsSource.Cast(Of String)().ToList(Of String)() 
                  dropDownItems.Add("New DropDown Item.") 
                  e.DropDownItemsSource = dropDownItems 
              End Sub 
      
  • DropDownClosed: This event is raised when the Telerik.Windows.Controls.TabControl.DropDownMenu is closed. This is a RoutedEvent. The event arguments are of type DropDownEventArgs.

  • ItemReordered: This event occurs when an item is reordered while dragging. This is a RoutedEvent. In order for this event to be raised, the AllowDragReorder property needs to be set to True. The event arguments are of type ItemReorderedEventArgs and expose the following members:

    • OldIndex: Gets the previous index of the dragged item.

    • NewIndex: Gets the next index of the dragged item.

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