By default, the ToolTipTitle property is empty string. The ToolTipTitle defines the title for the node's tooltip. Use the ToolTip property to assign a tooltip to a node. The node's tooltip shows up when the cursor hovers the node. Use the ToolTipDelay property to  specify the time in ms that passes before the ToolTip appears. 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 assign a font for the control's tooltip. The ShowToolTip method shows programmatically the control's tooltip.