A Boolean expression that specifies whether rhe selection is indented forward or
backward.
The IndentSel method indents programmatically the selection.
The IndentOnTab property indicates that the selection is indented as soon as user presses the TAB key.
Use the UseTabKey property specifies whether the control uses the TAB key. The AutoIndent
property specifies whether the control indents the line when ENTER key is pressed.
