Access to other apps, with transparent application background

[SOUS]

Hi there,

I am letting a transparent area in my main window, and i want to keep it always on top, and be able to do actions on a Google chrome windows appearing behind it.
It seems it was working just fine then, i don't understand why, i guess a toggled an option somewhere, but i does not work anymore.
My application is still on top, but i cannot access anything that is appearing through the transparent area. I can't find what has been changed...
Any idea ?

[SOUS]

Well, just to let you know, i found it...
It looks that if, as transparency key, i use a color that is not white, black or any shade of gray, what's appearing behind is not accessible...

[Illescasz]

I would like to know the truth about this content that I have three cars to publish it?