A Jmp graph with different Overlay categories - with a trick it's possible to create it:

on the left: weight split by # doors
on the right: weight split by year.
Besides the trick, how can I use Overlay to create the graph?
dt = Open( "$SAMPLE_DATA/Cars.jmp" );
dt << New Column( "Count_Make", Formula( Col Number( 1, :Make ) ));
dt << Graph Builder(
Variables( X( :Make ), X( :Make ), Y( :Wt ), Overlay( :Year, :Doors ) ),
Elements( Position( 1, 1 ), Box Plot( X, Y,Overlay( 2 ) ) ),
Elements( Position( 2, 1 ), Box Plot( X, Y,Overlay( 1 ) ) ),
Local Data Filter(
Add Filter( columns( :Count_Make ), Where( :Count_Make >= 25 ) )
)
)