RadContextMenu doesn't attach to Canvas in Group Header

[Sergey]

When I attach RadContextMenu to Canvas inside DataTemplate of GroupHeaderControlTemplate, group header's context menu gets overriden by the context menu that is attached to the ScheduleView:

<telerik:RadScheduleView.GroupHeaderContentTemplate>

    <DataTemplate>

        <Canvas Width="100">

            <telerik:RadContextMenu.ContextMenu>

                <telerik:RadContextMenu>

                    <telerik:RadMenuItem Header="Group Header Context Menu" />

                </telerik:RadContextMenu>

            </telerik:RadContextMenu.ContextMenu>

        </Canvas>

    </DataTemplate>

</telerik:RadScheduleView.GroupHeaderContentTemplate>



<telerik:RadContextMenu.ContextMenu>

    <telerik:RadContextMenu>

        <telerik:RadMenuItem Header="Schedule View Context Menu" />

    </telerik:RadContextMenu>

</telerik:RadContextMenu.ContextMenu>

It works if you use TextBlock instead of Canvas in DataTemplate, but I want the context menu to appear even if the user doesn't right-click directly on the TextBlock but anywhere in the group header cell. The way I'm trying to achieve this is by putting transparent canvas over TextBlock and any other element I will put inside DataTemplate.