How to popup the menu when right click on EMPTY area on a grid

How to add items to Menu if PopupMenuShowingEventArgs.Menu is null?
I try to call menu on empty area of Grid for add new row, but now it is impossible (System.NullReferenceException returned):

C#
private void lockView_PopupMenuShowing(object sender, DevExpress.XtraGrid.Views.Grid.PopupMenuShowingEventArgs e)
{
    GridView view = sender as GridView;
    view.FocusedRowHandle = e.HitInfo.RowHandle;
    foreach (DXMenuItem item in menuItems)
        e.Menu.Items.Add(item); // <= System.NullReferenceException
}

Finally, I solved my problem by this way:

C#
private void lockView_PopupMenuShowing(object sender, DevExpress.XtraGrid.Views.Grid.PopupMenuShowingEventArgs e)
{
    GridView view = sender as GridView;
    if (e.Menu == null && e.MenuType == GridMenuType.User && e.HitInfo.HitTest == GridHitTest.EmptyRow)
    {
        e.Menu = new GridViewMenu(view);
    }
    e.Menu.Items.Add(menuItems[0]);
    if (e.HitInfo.InRow)
    {
        view.FocusedRowHandle = e.HitInfo.RowHandle;
        e.Menu.Items.Add(menuItems[1]);
    }
}

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