//function clean the transform effect
private void clearTransform()
{
browser.clearTransform();
TranslateTransform transform = imageTransformGroup.Children[3] as TranslateTransform;
transform.X = 0;
transform.Y = 0;
ScaleTransform transformScale = imageTransformGroup.Children[0] as ScaleTransform;
transformScale.ScaleX = 1;
transformScale.ScaleY = 1;
browser.ZoomIn(1, transformScale);
}