To set any of the chart properties, use ch.Set in the same way as ŒWS, with a list of (property value) pairs.

ch.Set ('Head' 'A Heading')('Key' 'First,Second')

If no property is given, the ‘Style’ property is assumed:

ch.Set 'boxed,grid'

Only the first two letters of the property name are significant, and case is ignored.