Image source won't to update

Hi.
I created a bitmap like this: bitmap.WritePixels(new Int32Rect(0, 0, bmp_width, bmp_heigth), pixels, (int)stride, 0); and it shows nice. I use all values for pixels 128 and can see my bitmap as it have to be grey.    MyImage.Source = bitmap;
Then I added one button to make the same but with another values "0". But for some reason when I press the button the image is still grey. It seems that   MyImage.Source = bitmap; wasn't updated.
What do I missing here? How can I update the source of the image at the run time?
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mastiSoftAsked:
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Fernando SotoRetiredCommented:
Hi mastiSoft;

Try doing this after updating the image.
// First clear the source 
MyImage.Source = null;
// Then add it back in
MyImage.Source = bitmap;

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