property Group.ToolTip as Variant
Specifies the group's tooltip.

TypeDescription
Variant A string expression that indicates the item's tool tip.

By default, the group's tooltip is empty. If the ToolTip property is empty the control displays no tooltip when the cursor hovers the group's caption. The ToolTip shows up when the cursor hovers the group's caption. Use the ToolTipDelay to specify the time in ms that passes before the ToolTip appears. In this case no tooltip is displayed when cursor is over the group's caption. Use the ToolTipWidth property to specify the width of the tooltip window. 

The ToolTip supports built-in HTML format that may includes the followings:

Newer HTML format supports subscript and superscript like follows:

Also, newer HTML format supports decorative text like follows: