RadTreeMap CustomMapping last item never has children

[Peter]

When using RadTreeMap and defining a CustomMapping for the TypeDefinition, the last item in the collection never has any children...

Protected Overrides Sub Apply(treemapItem As RadTreeMapItem, dataItem As Object)
    Dim ie = DirectCast(dataItem, MainPage.ImageEntry)
    Dim grid = treemapItem.ChildrenOfType(Of Grid).SingleOrDefault
    If Not grid Is Nothing Then
        grid.Background = New ImageBrush With {.ImageSource = ie.Icon, .Stretch = Stretch.Uniform, .AlignmentX = AlignmentX.Center, .AlignmentY = AlignmentY.Center}
    Else
        ' last item ends up here
    End If
End Sub

...all the other items work OK, and if you add an additional item to the end, it becomes the one without Children.  Is this part of being "beta", or is this intended behavior?

[Ves]

Hi Peter,

Indeed, this effect is observed. Our developers are aware of it and a fix will be available in the next weekly internal build, expected to become available on Monday. For the time being you can either use the BrushColorizer as described in the other forum thread you have started or wire the SizeChanged event for that last item and apply the changes in its event handler. The second approach is shown in the Custom Mapping example. Another temporary solution would be to call the ApplyTemplate method for that last item manually and then find the grid in it.

Best regards,
Ves
the Telerik team