[SOLVED] Bind to specific AncestorType, skipping derived types

Bind to specific AncestorType, skipping derived types

I'm using a DevExpress LayoutGroup, which constructs multiple children I have no influence on. The LayoutGroup has an IsCollapsible property, which, when true, adds a button to the group's header and the functionality of collapsing/expanding the group's content.

The constructed visual tree looks like this:

[LayoutControl]
  CollapsibleNavigationGroup [LayoutGroup]
    [GroupBox]
      [Container]
        BorderElement [Border]
          [LayoutControl]
            TitleElement [Container]
              TitleContent [LayoutControl]

This usually only works when clicking the button itself but I extended the functionality to clicking the header. Now, if the GroupBox is collapsible I want the cursor to change to a hand when hovering above the header, so I did this in its template:

<dxlc:LayoutControl x:Name="TitleContent"
                    Cursor="{Binding IsCollapsible, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type dxlc:LayoutGroup}}, Converter={StaticResource BoolToCursorConverter}}">

However, LayoutControl is derived from LayoutGroup and thus FindAncestor does not actually find my CollapsibleNavigationGroup but the element's grand-parent, the nameless LayoutControl. Now I wonder, is there any way to tell the relative source binding to actually look for this exact type and ignore any derived types?

Solution

Now I wonder, is there any way to tell the relative source binding to actually look for this exact type and ignore any derived types?

No, there isn't. But you can set the AncestorLevel property to 2 to skip the first ancestor of the type specified by the AncestorType property, e.g.:

<dxlc:LayoutControl ... Cursor="{Binding IsCollapsible, RelativeSource={RelativeSource Mode=FindAncestor, 
                        AncestorType={x:Type dxlc:LayoutGroup}, 
                        AncestorLevel=2}, Converter={StaticResource BoolToCursorConverter}}">