How do I set icon to temporary toolbar buttons ?

Hi,

I am adding toolbar buttons through my VS Package's Initialize() method this way

var button = (CommandBarButton) toolbar.Controls.Add(MsoControlType.msoControlButton, //Type
                        Type.Missing, // Id
                        Type.Missing, // Parameter
                        Type.Missing, // Before
                        true // Temporary
                );

I have some icons as embedded resource that I can fetch as BitmapImage or ImageSource typed objects. How do I assign it to the button I added above ?

Fahad