Index: trunk/kernel/admin_templates/incs/grid.js
===================================================================
diff -u -r5257 -r5302
--- trunk/kernel/admin_templates/incs/grid.js	(.../grid.js)	(revision 5257)
+++ trunk/kernel/admin_templates/incs/grid.js	(.../grid.js)	(revision 5302)
@@ -155,8 +155,11 @@
 			this.Toggle()
 		}
 		else {
-			this.Grid.ClearSelection(null,'GridItem.Click');
-			this.Toggle();
+			if (!(this.Grid.RadioMode && this.Grid.LastSelectedId == this.ItemId)) {
+				// don't clear selection if item same as current is selected
+				this.Grid.ClearSelection(null,'GridItem.Click');
+				this.Toggle();
+			}
 		}
 	}
 	this.Grid.CheckDependencies();