title: ImageList pictures not showing up in ImageIndex or ImageKey
body: <p>I've encountered an annoying problem while creating a new application today.</p>
  
  <p>I was trying to add an image to a <code>TabControl</code> in Windows Forms (vb.net) using an <code>ImageList</code> but for some reason they no longer show up in the <code>ImageIndex</code> or <code>ImageKey</code> properties of controls. It keeps showing (none) only.</p>
  
  <p>Never had this before and haven't done anything unusual.</p>
  
  <p>Anyone else had this problem?
  Can't find anything on the web.</p>
  
  <p>I'm using Visual Studio 2015.</p>
  
  <p><a href="https://i.stack.imgur.com/Fx2Fq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Fx2Fq.png" alt="enter image description here"></a></p>