diff --git a/MatterControl.Winforms/WinformsSingleWindowProvider.cs b/MatterControl.Winforms/WinformsSingleWindowProvider.cs
index f3b1f69af..48b3ff5ee 100644
--- a/MatterControl.Winforms/WinformsSingleWindowProvider.cs
+++ b/MatterControl.Winforms/WinformsSingleWindowProvider.cs
@@ -46,6 +46,7 @@ namespace MatterHackers.MatterControl
 				platformWindow = winform;
 			}
 
+			systemWindow.PlatformWindow = winform;
 			base.ShowSystemWindow(systemWindow);
 		}
 	}