See this example for a user function.
Names Default to Here( 1 );
exists = Function( { db expr },
Try(
db expr;
1,
0
);
);
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
biv = dt << Bivariate( Y( :weight ), X( :height ), Fit Line );
bivr = biv << Report;
If( exists( Expr( bivr[OutlineBox(1)] ) ), "I'm here!", "Where did I go?" );
If( exists( Expr( bivr[OutlineBox(100)] ) ), "I'm here!", "Where did I go?" );