Clicked on the group header and collapsed group

[Elena]

Hello,

Sometimes unintentionally clicked on the group header and collapsed group, How can prevent collapsed group ? or collapse like expander if clicked on the button expand or collapse?

[Maya]

Hello Elena,

Generally, the whole element is a RadToggleButton which will be checked/unchecked no matter where exactly on it you have clicked. What you can try is to verify the exact place and cancel the bubbling of the mouse event. For example:

public MainWindow()
       {
           InitializeComponent();
           this.AddHandler(RadToggleButton.PreviewMouseLeftButtonDownEvent, new MouseButtonEventHandler(OnPreviewMouseLeftButtonDown), true);
       }
       private void OnPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
       {
           var element = e.OriginalSource as FrameworkElement;
           var toggleButton = element.ParentOfType<RadToggleButton>();
           if (toggleButton != null && element.Name != "IconInnerBorder")
           {
               e.Handled = true;
           }
       }

Regards,
Maya
Telerik