Page.ControlTipText Property (Outlook Forms Script)
Returns and sets a String that specifies text that appears when the user briefly holds the mouse pointer over a control without clicking. Read/write.
The ControlTipText property lets you give users tips about a control in a running form. The property can be set during design time but only appears by the control during run time.
The default value of ControlTipText is an empty string. When the value of ControlTipText is set to an empty string, no tip is available for that control.