Find and Expand all nodes of an ADF Tree

I want to find and expand all nodes of an ADF Tree and I saw an Oracle Forum post of Kenyatta which gave me a nice solution.
First some usefull methods.

private void expandTreeChildrenNode(  RichTree rt
                                   ,  FacesCtrlHierNodeBinding node
                                   ,  List<Key> parentRowKey) {
     ArrayList children = node.getChildren();
     List<Key> rowKey;

     if ( children != null )    {
       for (int i = 0; i < children.size(); i++) {
          rowKey = new ArrayList<Key>();
          rowKey.addAll(parentRowKey);
          rowKey.add(((FacesCtrlHierNodeBinding)children.get(i)).getRowKey());
          rt.getDisclosedRowKeys().add(rowKey);
          if (((FacesCtrlHierNodeBinding)(children.get(i))).getChildren() == null)
            continue;
            expandTreeChildrenNode(rt
                                  ,(FacesCtrlHierNodeBinding)(node.getChildren().get(i))
                                  , rowKey);
          }
     } 
}

 // find a jsf component
private UIComponent getUIComponent(String name) {
     FacesContext facesCtx = FacesContext.getCurrentInstance();
     return facesCtx.getViewRoot().findComponent(name) ;
}

private UIComponent getUIComponent(UIComponent component,String name ){
     List<UIComponent> items = component.getChildren(); 
     for ( UIComponent item : items ) { 
       UIComponent found = getUIComponent(item,name);
       if ( found != null ) {
         return found; 
       }
       if ( item.getId().equalsIgnoreCase(name)  ) { 
         return item;
       }; 
     }
     return null;
} 

Now find the ADF tree in a region and expand the main and child nodes of this tree

// get the dymamic region of the main page
RichRegion region = (RichRegion)getUIComponent("dynam1");

if ( region != null) {
   // find tree 2 and expand this tree 
   RichTree rt = (RichTree)getUIComponent(region,"t2");
   if ( rt != null ) {
      int rowCount = rt.getRowCount();
      List<Key> rowKey;
      for (int j = 0; j < rowCount; j++) {
         // expand the main nodes
         FacesCtrlHierNodeBinding node = (FacesCtrlHierNodeBinding)rt.getRowData(j);
         rowKey = new ArrayList<Key>();
         rowKey.add(node.getRowKey());
         rt.getDisclosedRowKeys().add(rowKey);
         rt.setRowKey(rowKey);
         // expand the child nodes of the main nodes
         expandTreeChildrenNode(rt , node, rowKey);
       }   
    }
}