Error in expanding GWT Tree

Hi, in my WebApp I use a GWT Tree. I have made a Button, when you klick this button the whole tree should be expanded / closed.

But when I click the button sometimes a TreeItem does not close. When I debug this I can see that the open state is not changed but I called the method treeItem.setState(open).

So I don't know why this isn't changed in my TreeItem.

Any suggests ? 

Thanks in advance.

 

Here is my onClick Method:

 public void onClick( ClickEvent event )

  {

    Object source = event.getSource();

    if ( source.equals( getView().getButtonBaumEinAusKlappen() ) )

    {

      for ( int i = 0; i < getView().getTree().getItemCount(); i++ )

      {

        TreeItem myTreeItem = getView().getTree().getItem( i );

        

        if(myTreeItem.getChildCount()>0)

          getView().getTree().expandAll( myTreeItem, !expandState );

        

        myTreeItem.setState( !expandState );

        int andkw = 5;

     }

      expandState = !expandState;

    }

}

and here is my epandAll method: 

 public void expandAll( TreeItem item, boolean expand )

  {

    for ( int i = 0; i < item.getChildCount(); i++ )

    {

      // do action here

      TreeItem childTreeItem = item.getChild( i );

      childTreeItem.setState( expand );

      // recursive call for current node.

      expandAll( childTreeItem, expand );

    }

  }

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