REPORT-4192 切换tab后重命名actio也要重新初始化下

designer_form/src/com/fr/design/mainframe/FormHierarchyTreePane.java

@@ -92,6 +92,7 @@ public class FormHierarchyTreePane extends FormDockView implements HierarchyTree
 	public void refreshDockingView() {
 		FormDesigner formDesigner = this.getEditingFormDesigner();
 		removeAll();
+		changeVarNameAction = null;
 		if(this.componentTree != null) {
 			this.componentTree.removeAll();
 		}