Quote Originally Posted by LinkFX View Post
How do I then forward the clicks from my toolbar's buttons to the target toolbar's so that their respective functions execute when my replacement buttons are clicked?
That's exactly what my example has shown (did you try it)?

The Overlay-hWnd (from the PictureBox) is just there for "drawing new stuff at the correct button-positions".

Whilst the original functionality is still there - and provided by "the hWnd beneath it".

So this works (with MouseActions), as if the Overlay-Window weren't there at all...
because it was disabled (has .Enabled = False) - and thus all the "Clicks fall through to the Parent".

Olaf