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I insert a bitmap on a window and I set this bitmap transparent with

@ nRow, nCol BITMAP oSprite;
RESOURCE cBitmap;
PIXEL NOBORDER of oWnd // SIZE 64,64

nTipo:=nItem

oSprite:lTransparent = .T.


but on window this bitmap not is trasparent see the picture pls :



you can see there 's not the grid down the bitmap

wich is the problem ?