WS_EX_TRANSPARENT – What does it actually do?

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WS_EX_TRANSPARENT makes your events (like mouse clicks) fall through your window, amongst other things. Opacity is a separate concept, it instructs window manager to apply alphablending when drawing your form. Those two things are not related, but when you combine them you get the effect you need in your case.

So:

  1. Paint method of your form is called normally as it should, opacity has nothing to do with it.

  2. Opacity does not have anything to do with mouse events, as described in the first paragraph.

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