How to make a picturebox transparent

[technorobbo]

Here's a technique that I worked out to make a picturebox see thru.

Layered windows are considered the top most window with no parent - but if you take a picturebox set it's parent to zero you can make it transparent then set the form as it's parent again. you must refresh immediately to lock the graphics. the drawback is that the coordinates are now screen coordinates but I use ClientToScreen and a timer to keep it aligned.