Similar to the Heading control, but shows an arrow next to the title. By toggling the arrow, all fields inside the heading will be shown or hidden. Unlike Heading with checkbox, the fields will still be validated and their values will be sent to the Insert Update procedure regardless of visibility.
In this example, "Car info" is the collapsible heading, with three textboxes inside it.
By clicking the heading, the three textboxes are hidden from view, although they still "exist" (their values will still be saved when the user clicks "Save", for example).
Retrieves the default value for the control.