The only way I can think of is to do a little scripting, here is an example on big class:
Open( "$SAMPLE_DATA/Big Class.jmp" );
Data Table( "Big Class" ):age << Set Modeling Type( "Continuous" );
cp = Contour Plot(
SendToByGroup( {:sex == "F"} ),
X( :height, :weight ),
Y( :age ),
Show Data Points( 1 ),
Fill Areas( 1 ),
Label Contours( 0 ),
By( :sex ),
);
For( i = 1, i <= N Items( cp ), i++,
cp[i] << SendToReport(
Dispatch(
OutlineBox(1),
"1111",
ScaleBox,
{Legend Model(
1,
Type( 0, 262144, Item ID( "age", 1 ) ),
Properties(
0,
{gradient( {Color Theme( "Blue to Gray to Red" )} )},
Item ID( "age", 1 )
)
)}
)
)
);