Why is it not possible to generate this graph in JMP?

[#1]

x axis: (first) Family Car
top graph: % of factor by sex
bottom graph: % of factor by age

Semiconductor Industry:
car = Lot
age = classification 1
sex= classification 2



The closest I can get without changing the data table:

Names Default to Here(1);
dt = Open( "$SAMPLE_DATA/Big Class Families.jmp" );
dt << New Column( "First Family Car",
	Character,
	Formula( Word( 1, :family cars, "," ) )
);
Graph Builder(
	Transform Column( "dummy", Formula( 1 ) ),
	Size( 665, 541 ),
	Show Y Axis Title( 0 ),
	Variables(
		X( :First Family Car ),
		Y( :dummy ),
		Y( :dummy ),
		Overlay( :age ),
		Color( :sex )
	),
	Elements(
		Position( 1, 1 ),
		Bar(
			X,
			Y,
			Legend( 4 ),
			Bar Style( "Stacked" ),
			Summary Statistic( "% of Factor" )
		)
	),
	Elements(
		Position( 1, 2 ),
		Bar(
			X,
			Y,
			Color( 0 ),
			Legend( 3 ),
			Bar Style( "Stacked" ),
			Summary Statistic( "% of Factor" )
		)
	),
	SendToReport(
		Dispatch( {}, "400", ScaleBox,
			{Legend Model(
				4,
				Properties(
					0,
					{Fill Pattern( "left slant heavy" )},
					Item ID( "F", 1 )
				),
				Properties(
					1,
					{Fill Pattern( "left slant heavy b" )},
					Item ID( "M", 1 )
				)
			)}
		)
	)
);

[#2]

workaround: stack +  Y Group

Data Table( "Big Class Families" ) << Stack(
	columns( :age, :sex )
);
Graph Builder(
	Variables( X( :First Family Car ), Group Y( :Label ), Overlay( :Data ) ),
	Elements(
		Bar(
			X,Bar Style( "Stacked" ),
			Summary Statistic( "% of Factor" )
		)
	)
);

[#3]

no workaround needed anymore
once Graph Builder [supports] Overlay by multiple columns