TransformToAncestor from RadDiagram bad value

[Valentin]

Hello Telerik,

 

I'm using a RadDiagram containing shapes. These shapes has TextBlock to display some text.

I search to get the position of a TextBlock inside this RadDiagram.

 

I did it (tb is a TextBlock and Me.MirBuilderDiagram is a RadDiagram) :

tb.TransformToAncestor(Me.MirBuilderDiagram).Transform(New Point(0, 0))

 

The problem is that values are false : the top-left corner of the RadDiagram is set to 20;20, and for a TextBock next to this corner, I get the wrong value. I tried to get the position with the parent of the RadDiagram (a Grid), but I have the same result.

 

I attached 2 screenshots with :

- raddiagram : showing you the visual RadDiagram

- debug : showing you the debug with an attached watcher.

 

How I can get the good values ?

Thank you.

 

[Valentin]

The problem is due to a custom operation, you can delete this post, sorry.