By default, the Tooltip property is empty. Use the ToolTip property to assign a tooltip to a column. The column's tooltip shows up when the cursor is over the header of the column. The control  fires the ToolTip event when the column's tooltip is about to be displayed. Use the ToolTipWidth property to specify the width of the tooltip window. Use the ToolTipDelay property to specify the time in ms that passes before the ToolTip appears. Use the ToolTipPopDelay property to specify period in ms of time the ToolTip remains visible if the mouse pointer is stationary within a control. Use the CellToolTip property to assign a tooltip to a cell.