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this._tree = new qx.ui.tree.Tree( trs );
this._tree.setHideNode( true );
this._tree.setRootOpenClose( true );
this._tree.setUseDoubleClick( false ); // true supresses dblclick events !
this._tree.setUseDoubleClick( true );
this._tree.setOverflow( qx.constant.Style.OVERFLOW_AUTO );
// TODO [rh] this is only to make the tree focusable at all