title: Suppress mouse hover effect on GridViewColumn
body: <p>I have a <code>GridViewColumn</code> with a <code>HeaderTemplate</code> that has an <code>Image</code> and a <code>TextBlock</code>. When the user hovers over the <code>Image</code> I am changing its opacity, but I am still getting the default header mouse over effect. How can I suppress this effect when the user hovers over the image?</p>