Change background color of button in silverlight 5 in code behind

I would like to change the background color of a button when I click on it. To make the button go from Red to Green to Red, etc...

However, when I click the background color doesn't change.

Here is what I have tried :

button4.Background.SetValue(BackgroundProperty,new SolidColorBrush(Colors.Red)); -> catastrophic error

button4.SetValue(BackgroundProperty,new SolidColorBrush(Colors.Red)); -> nothing

button4.Background = new SolidColorBrush(Colors.Red); -> nothing

3rd solution seems the most revelant but doesn't work.


I met the same problem with UserControl in Silverlight 5.

protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
  Background = new SolidColorBrush(Colors.Black); //nothing

But if I name the main Grid grid and write down these code:

protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
  grid.Background = new SolidColorBrush(Colors.Black); //ok

It works, I do not know why. When I need to use some complex opacity effects maybe I need some extra Rectangles and set their Fill. It's a little inconvenient.

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