Use widget id as argument for registry.remove as it takes an id and n…

…ot a widget instance.

Add destroyRecursive method becuase containers check for and call destroyRecursive in their destroyDecendants cleanup.

extensions/DijitRegistry.js

@@ -26,10 +26,14 @@ function(declare, registry){
 				this._resizeHandle.remove();
 			}
 		},
+
+		destroyRecursive: function() {
+			this.destroy();
+		},
 
 		destroy: function(){
 			this.inherited(arguments);
-			registry.remove(this);
+			registry.remove(this.id);
 		},
 
 		getChildren: function(){
@@ -38,4 +42,4 @@ function(declare, registry){
 			return [];
 		}
 	});
-});
+});