By default, the ToolTip / ToolTipTitle property is empty, which indicates no tooltip. The ToolTipTitle property indicates the title of the layer's tooltip. The layer's tooltip is shown if any of the ToolTip / ToolTipTitle property is not empty. Use the ToolTipWidth property to specify the width of the tooltip window Use the ToolTipPopDelay property specifies the period in ms of time the ToolTip remains visible if the mouse pointer is stationary within a control. Use the ToolTipFont property to change the tooltip's font. Use the Background(exToolTipAppearance) property indicates the visual appearance of the borders of the tooltips. Use the Background(exToolTipBackColor) property indicates the tooltip's background color. Use the Background(exToolTipForeColor) property indicates the tooltip's foreground color. Use the ShowToolTip method to display a custom tooltip. The DefaultLayer(exDefLayerToolTipTitl) property specifies the default value of the ToolTipTitle property.

The following screen shot shows the current value as a tooltip :