Explore Trees of Tree

Hi all,

I have a tree of trees. like this
[-]Tree Root (Tree.java)
   [-]SubTree1(Tree.java)
        Item1-1(TreeItem.java)
   [-]SubTree2(Tree.java)
        Item2-1(TreeItem.java)
        Item2-2(TreeItem.java)
        Item2-3(TreeItem.java)

I am force to use Tree for Sub trees because I want to be able to focus items in both trees.

When putting focus on Tree Root and pressing arrow down i can reach all items By using navigation keys up on tree when trying to select Item2-1 from Item2-2 i got the following error


java.lang.NullPointerException: null
    at com.google.gwt.user.client.ui.Tree.getTopClosedParent(Tree.java:1048)
    at com.google.gwt.user.client.ui.Tree.moveSelectionDown(Tree.java:1210)
    at com.google.gwt.user.client.ui.Tree.keyboardNavigation(Tree.java:1107)
    at com.google.gwt.user.client.ui.Tree.onBrowserEvent(Tree.java:654)
    at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1321)
    at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1277)
    at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:167)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:326)
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:207)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:132)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
    at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:214)
    at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:167)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:281)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:531)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:352)
    at java.lang.Thread.run(Thread.java:662)

I expect to explore tree and subtree by using arrows keys

I am using gwt2.3.0 on windows using firefox

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