title: How can I gray-out a disabled PictureBox used as Button?
body: <p>I'm using Picturebox control as a Button in my app's main dashboard.<br>
  The PictureBox has of course an Image that identifies the Button function.  </p>
  
  <p>If I use normal Button controls, when disabled, the Buttons' Image it grayed out automatically.<br>
  This doesn't happen using a PictureBox.  </p>
  
  <p>How can I generated the same <em>effect</em> using a Picturebox.</p>