A boolean expression that specifies whether the control uses the TAB key.
By default, the UseTabKey is False. If the UseTabKey
property is True, the control inserts a TAB character at the caret position,
or indents the selection ( if multiple lines are selected ). If the
UseTabKey property is False, the control doesn't handle the TAB key. If the
UseTabKey property is False, the TAB key focuses the next visible control in
the form. If the Locked property is True,
the UseTabKey property is False.
