The 'tabstop' property

Boolean scalar

Valid for: Check, Radio, Button, Progress, Trackbar, Spinner, Scroll, List, Combo, Edit, RichEdit, Movie, Splitter, Selector, Page, Tree, Frame

If the tabstop property for a control is 1, the user can move the focus to the control using the Tab key (the sequence is determined by the order property, and defaults to the order of creation). If the tabstop property is 0, the control cannot be tabbed to.

Note: Under MacOS, only a control which can accept keyboard focus (such as an Edit or RichEdit control) can be tabbed to. This is because of the user-interface conventions which apply in MacOS.