In WP7 whenever a button is clicked ,the background of button becomes white showing that button is clicked and becomes normal on releasing the mouse button.But I want to cha
If you're developing for Windows phone, Blend is free and it's an incredibly powerful. I would go so far as to say mandatory, I highly recommend you use it. In Blend it's a simple matter of editing the "Pressed" state style.
Right Click on the button -> Edit Template -> Create Copy (Just choose the defaults for the save dialogue)
Click on the "states" tab: (You'll see a list of all the different visual states the button can have)
And you're done!
Compare that to trying to edit the raw XAML, as you would have to in VS.