Hello Bradley Lane,
Thank you for the question.
As the description of the property states, a ToolTip is shown when you hover the tabitem of a ToolWindow (in case the tabitem is visible):
"Gets or sets the tooltip to be displayed when the mouse hovers the tabitem of this panel."
However, this property is not applicable to the titlebar part and currently we do not support such functionality.
If you have additional questions, feel free to contact me.
the Telerik team
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