PreviewSelectionChanged and child window

[Josh]

HI,

I am trying to use the PreviewSelectionChanged event on the radtabcontrol to capture a confirmation child window popup, can cancel that selection change in the tab control when I click cancel on the tab control, which should set the e.Handled in the PreviewSelectionChanged event to true.

But the problem is, the child window will not be shown until the previewselectionchanged event has finished executing.

eg.

            CustomerTabs.PreviewSelectionChanged += (s, e) =>
            {
                if (e.OriginalSource == this.CustomerTabs)
                {
                   var view = new CustomChildWindow();
 
                    view.Show();

                    view.Closed += (ss, ee) =>
                        {
                            e.Handled = true;
                        };
 
                }
            };

Please advice...or give me an alternative to prevent selection of tab.

[Petar Mladenov]

Hello Josh,

Yes, the childwindow shows after the previewevent completes. Instead, you can use a MessageBox like so:

private void tabControl_PreviewSelectionChanged(object sender, Telerik.Windows.Controls.SelectionChangedEventArgs e)
     {
         if ((sender as RadTabControl).SelectedIndex == 1)
         {
             MessageBoxResult result = MessageBox.Show("Do you realy want to use tab 1?", "Question", MessageBoxButton.OKCancel);
             if (result == MessageBoxResult.Cancel)
             {
                 e.Handled = true;
             }
         }
     }

Could you please let me know if this approach satisfies you or not?

Best wishes,
Petar Mladenov
the Telerik team