By default, the UseTabKey is False. If the UseTabKey property is True, the control inserts a TAB character at the caret position. 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. The AutoIndent property specifies whether the control indents the line when ENTER key is pressed. The IndentOnTab property indicates that the selection is indented as soon as user presses the TAB key. The IndentSel method indents programmatically the selection.