Vista - Change image cause memory and GDI leak.

Dear all:

I have a ContentControl which has a Image as content.

When I dynamically create some BitmapSource, and change the

ImageSource of the image to new BitmapSource. It cause memory and GDI
leak.

How can I do to release the old ImageSource to avoid memory and GDI
leak?

Code:

Image img = _contentControl.Content as Image.

BitmapSource bs = ............; //Create new BitmapSource.

img.Source = bs;

BR

Wisenight