Dismissing popup

Hi John,

Are any of our controls used in this setup or is this more of a general WPF question?

I would think that a TreeView would capture the mouse wheel scroll if the mouse was over the TreeView at the time.  If that control didn't handle the mouse wheel event, I could see it bubbling up to the ScrollViewer that is probably in your property page.  Determining when the mouse wheel event fires in the property page would be tougher though since the nested ScrollViewer control likely handles it.  It might need you to attach to the PreviewMouseWheel event.

I'm using this control...

actipro\Ribbon\Windows\Controls.Ribbon\Controls\PopupButton

<actipro:PopupButton.PopupContent>
 <Border BorderThickness="1" BorderBrush="{x:Static SystemColors.ActiveBorderBrush}">
  <ScrollViewer VerticalScrollBarVisibility="Auto" CanContentScroll="True" HorizontalScrollBarVisibility="Disabled">
   <MyTreeView x:Name="_popup" PreviewMouseLeftButtonUp="Popup_OnMouseLeftButtonUp" PreviewLostKeyboardFocus="Popup_OnLostKeyboardFocus" PreviewKeyDown="Popup_OnKeyDown"/>
  </ScrollViewer>
 </Border>
</actipro:PopupButton.PopupContent>

Hi John,

The WPF TreeView control has its own ScrollViewer within its control template so you shouldn't need another ScrollViewer surrounding it.  You can use various ScrollViewer attached properties right on TreeView to set properties like VerticalScrollBarVisibility.

My recommendation would be to handle the mouse wheel event appropriately in your custom MyTreeView control.  Setting e.Handled should prevent it from bubbling up past that into any ScrollViewers that contain the MyTreeView (and thus PopupButton).  As for closing the popup, you'd have to probably handle the ScrollChanged event of the ScrollViewer that contains the PopupButton and in that, set the PopupButton.IsPopupOpen property to false if it's true.

Or if I'm not understanding the problem properly, please provide some more detail.  Thanks!