cursors, dragboxes with VB.net

I want to use alternate drawing in VB.Net. This means that you can draw any foregroundimage above an existing background image which makes them blend; but upon a second draw-action of the foregroundimage the original background image is completely restored (this is possible in HTB and HP Rocky Mountain Basic).

Another thing I need is to be able to save parts of a control-area into an array and place it into any other location of that control (or even another control ?).