The SearchColumnIndex property indicates the index of the column being used by the control's incremental search feature. The user changes the searching column if he presses TAB or Shift + TAB. Use the UseTabKey property to specify whether the control uses the TAB key. Use the AutoSearch property to specify whether the control enables the incremental searching feature. Use the AutoSearch property to specify the type of incremental searching the control supports within the column. Use the MarkSearchColumn property to hide the rectangle around the searching column.