🚀 go-pugleaf

I have a node which has child nodes and i would like to add it to  a jtree in expanded state.  How can this be done.  Right now when I add it to root it it collapsed. I have tried the following but I get the follwoing exception

.... 
String[] path = =new String[2];
path[0] = "MYROOT"
path[1] = "MyNode"
TreePath p = new TreePath(path);
tree.expandPath(p);   //this is the line at  for the following exception at mypackage1.CommTree.expandNewNode(CommTree.java:1437)

Any Ideas?


-----here is the exception ---
java.lang.ClassCastException

	at javax.swing.tree.DefaultTreeModel.isLeaf(DefaultTreeModel.java:185)

	at javax.swing.JTree.expandPath(JTree.java:1746)

	at mypackage1.CommTree.expandNewNode(CommTree.java:1437)

	at mypackage1.CommTree.AddCommentary(CommTree.java:1151)

	at mypackage1.CommTree.commTypeList_mouseClicked(CommTree.java:1081)

	at mypackage1.CommTree$24.mouseClicked(CommTree.java:1056)

	at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:208)

	at java.awt.Component.processMouseEvent(Component.java:5137)

	at java.awt.Component.processEvent(Component.java:4931)

	at java.awt.Container.processEvent(Container.java:1566)

	at java.awt.Component.dispatchEventImpl(Component.java:3639)

	at java.awt.Container.dispatchEventImpl(Container.java:1623)

	at java.awt.Component.dispatchEvent(Component.java:3480)

	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3450)

	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3174)

	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3095)

	at java.awt.Container.dispatchEventImpl(Container.java:1609)

	at java.awt.Component.dispatchEvent(Component.java:3480)

	at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)

	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)

	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)

	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)

	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)

	at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)