What exactly are you trying to do?
Ok. I want to show a Screenshot of that Window when i move the mouse over the button. I see that in Windows Vista Beta 2

I can get a picture every X seconds. That picture is for every window, i mean, for every Hwnd. So, every Picture have the Hwnd in the Tag property

I have not problem with Pictures of every Window

When i move the mouse over a button, i need to know to what window it belongs and then can show the apropiate screenshot

With ActiveAccessibility i can get the Text of the buttons, but if two windows have the same Title then i can't know wich Window it belong

Just like this

http://www.winsupersite.com/images/showcase/5219_07.jpg

Again, thanks for all the help and sorry about my bad english