I use GXT 3.0.1 and I have a grid with the sort on columns by single click.
I want to add double click to show an AlertMessageBox,
but the event is not fired.
Where am I wrong?
Thanks in advance

grid.addHeaderDoubleClickHandler(new HeaderDoubleClickHandler() {

       public void onHeaderDoubleClick(HeaderDoubleClickEvent event) {
                Log.debug("Header Double Click"); 
                                final AlertMessageBox d = new AlertMessageBox("Selected",                        "Column: \n" + event.getColumnIndex());
                d.addHideHandler(new HideEvent.HideHandler() {
                    public void onHide(HideEvent event) {