Index: /CKEditor/branches/versions/3.4.x/_source/plugins/dialog/plugin.js
===================================================================
--- /CKEditor/branches/versions/3.4.x/_source/plugins/dialog/plugin.js	(revision 6083)
+++ /CKEditor/branches/versions/3.4.x/_source/plugins/dialog/plugin.js	(revision 6084)
@@ -1030,5 +1030,5 @@
 		{
 			var tab = this._.tabs[id] && this._.tabs[id][0];
-			if ( !tab || this._.pageCount == 1 || !tab.isVisible() )
+			if ( !tab || this._.pageCount == 1 )
 				return;
 			// Switch to other tab first when we're hiding the active tab.