Turn on the label attribute for your comments column. When you hover over a point the comment will appear. Move the mouse into the comment box and click the thumbtack to make the comment permanent.
New Table( "Test GB Comments", Add Rows( 4 ),
New Script(
"Y vs. X", Graph Builder(
Size( 517, 452 ), Show Control Panel( 0 ),
Variables( X( :X ), Y( :Y ) ),
Elements( Points( X, Y, Legend( 3 ) ), Line( X, Y, Legend( 5 ) ) )
)
),
New Column( "X", Numeric, "Continuous", Format( "Best", 12 ),
Set Values( [1, 2, 3, 4] ) ),
New Column( "Y", Numeric, "Continuous", Format( "Best", 12 ),
Set Values( [2, 5, 1, 2] ) ),
New Column( "Comments", Character, "Nominal",
Set Values( {"", "Too high", "Too low", ""} ) ),
Set Label Columns( :Comments ) // This will enable "hover" comments in the graph
);