I have two GLControl windows working just fine in my windows form. For organization purposes I added a 3rd GLControl in a separate tab control form. However, when I switch to the second tab, the GLControl windows does not show up. In fact, the display from the previous tab is shown. The tabs work just fine without GLControls in them, so is there something special I have to do to make GLControls work in multiple tabs or is this possibly a bug? I can post code if necessary, but not sure what I would post exactly. The GLControl show up just fine when looking at form in design mode, but as soon as I run the code the issue occurs. Thanks in Advance.