One entity, lets call it EntityA with three attributes: ShortDescr (text), LongDescr (text) and ShowLongDescr (boolean). In a form, place a dataview pointing to EntityA. Inside the dataview, three rows: one for each attribute. On the row for LongDescr, make the row conditionally visible based on the value of ShowLongDescr. When ShowLongDescr is changed, the LongDescr will be shown or not. If you want to have the text for the Descr attributes not appear in an input field, use the FormatString widget from the appstore.