Big Problem with StaticBitmap and MemoryDC

Hi to All (and Mr. Robert Roebling),

I was using in wxNet 0.62 and has wrote with the code:

wx.MemoryDC myClientDC = new wx .MemoryDC();
wx.Bitmap b = new wx.Bitmap (400, 400, 72 );
myClientDC.SelectObject( b );
myClientDC.Clear();
myClientDC .Pen = new wx.Pen ( wx.Colour.wxBLACK , 2, wx.FillStyle.
wxDEFAULT);
myClientDC.Brush = new wx.Brush( wx .Colour.wxCYAN, wx. FillStyle.wxSOLID );
myClientDC. DrawRectangle( 10, 10, 200, 200 );
this .myStaticBitmap.Bitmap = b;
myClientDC.SelectObject( wx. NullObjects.wxNullBitmap );
myClientDC. Dispose();

And this work fine (to draw a rectangle in a Bitmap and dispaly this in a
StaticBitmap).
But when I use the wx.net <http://wx.net> version 0.72, the same code
don't display the Rectangle in the StaticBitmap. I use the idea
from wxNullBitmap in the SelectObject, but equal don't work.

Somebody know what i am doing bad?