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making a SharedWhiteBoard bg transparent
hey guys. and girls 
the app that i'm developing here needs to use its whiteboard as a means to discussing images, so what it essentially needs to be is a transparent layer over an image thus allowing the users to 'draw' notes, lines etc directly 'onto' the image.
so what ive done is to set up a system whereby users can position their images ontop of which a SharedWhiteBoard resizes itself to stay the same shape/scale/xPosition/etc as the image. then what i want to do is make the SharedWhiteBoard bg transparent but not affect the transparency of any of its content, lines, boxes, etc.
_whiteBoard = new SharedWhiteBoard();
_whiteBoard.alpha = 0;
obviously makes the whole thing transparent, and i can't find a property like 'board' or 'background' or whatever to adjust.
how is this achieved?
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