Visibility.Collapsed/Hidden not working?

Ok im not sure why this aint working. Basically I have a BorderControl which hosts a Grid which hosts various controls. The borderControl starts with its Visibility set to Collapsed. When I click a button in my application the visibility is changed to visible and a quick animation is played.

This all works fine.

Now there is another button which will change the visibility of the BorderControl back to Collapsed. Problem is when I push the button it does nothing.

Code for the button

private void btnGClose_Click(object sender, RoutedEventArgs e)
{
      bdGroupEdit.Visibility = Visibility.Collapsed;
}

Any ideas as to why this might not work?