How do i catch double click event in gxt grid?

Here is what i am trying to do it. But double click event never fire this code.

grid.getSelectionModel().addListener(Events.
DoubleClick, new Listener<GridEvent>() {
publicvoid handleEvent(GridEvent be) {
MessageBox.alert("Test", "DoubleClick", null);
GridSelectionModel sm = be.grid.getSelectionModel();
}

});

Events.OnDoubleClick also not working.