$ perl -MWx -le"print for Wx::Window->new->ClientToScreen( 0,0 )" 0 0 $ perl -MWx -le"print for Wx::Window->new->ClientToScreen( [0,0] )" Wx::Point=SCALAR(0x98a3c4) $ perl -MWx -le"print for Wx::Window->new->ClientToScreen( Wx::Point->new( 0,0 ) )" Wx::Point=SCALAR(0xda76e4)