Fix Bug in Dotnet Bar related to multiple events and closing display tabs

PROMS/Volian.Controls.Library/DisplayTabControl.cs

@@ -886,9 +886,18 @@ namespace Volian.Controls.Library
 			if (myTabItem.ContainerControl == null) return;
 			Bar b = myTabItem.ContainerControl as Bar;
 			if (b != null)
+			{
+				try
                 {
                     b.CloseDockTab(myTabItem);
-				//b.Items.Remove(myTabItem);
+                }
+				catch 
+				{
+					//This is to work around a bug inside 3rd party DotNetBar
+					//The bug occurs when events happen out of order and it tries
+					//to remove a TabItem from the Collection the has already been removed
+				}
+
                 RemoveItem(myTabItem);
 			}
 		}