C# transparent canvas over OpenGL -

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i have following layout in c# windowsformhost host opengl window. add transparent canvas on draw 2d stuff. code doesn't work. please help. 

 mc:ignorable="d"> <grid>     <dockpanel>         <windowsformshost grid.column="0" x:name="scannerviewpanel"/>         <canvas background="transparent"/>

edit: after add canvas, opengl content not shown, opaque canvas. tried make canvas transparent, set opacity 0, it's still opaque.

from msdn:

in wpf user interface, can change z-order of elements control overlapping behavior. hosted windows forms control drawn in separate hwnd, drawn on top of wpf elements.

you can't that.


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