Try the below JSL, it is one way to do what you want
txnelson_0-1705980617413.png
Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/big class.jmp" );
// Plot 1
biv = dt << Bivariate( invisible, Y( :height ), X( :weight ), By( :sex ) );
dis = Distribution( Continuous Distribution( invisible, Column( :height ) ) );
// Create the window, with the first tab
nw = New Window( "Tabs",
Text Box( "here are the tabs" ),
tb = Tab Box( (Report( biv[1] )[Outline Box( 1 )]) << get title, Report( biv[1] ) )
);
//Plot 2
biv2 = bivariate( x( :height ), y( :weight ), invisible );
tb << Append( "Plot 2", hlb = H List Box( biv2 << Report ) ); // Add an H List Box to the tab
hlb << append( dis << report ); // Append additional items to the H List Box
Jim