$self->{events}->{EVT_GRID_CELL_RIGHT_CLICK} = Wx::Event::EVT_GRID_CELL_RIGHT_CLICK($self, \&showPopupMenu);

$self->{events}->{EVT_GRID_CELL_RIGHT_CLICK}->connect();
$self->{events}->{EVT_GRID_CELL_RIGHT_CLICK}->disconnect();