canvas DrawPicture does not work in WebDialog

Just insert a canvas in a WebDialog; in Paint event insert this code: g.DrawPicture pic, 0, 0.
In webPage call the WebDialog and the picture is not shown. The Paint event is fired. Every other command works fine but not g.DrawPicture

Xojo version: 2015 r2_4

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ok, feedback case 41432