Gets or sets the text that appears when the mouse pointer hovers over a System.Windows.Forms.TreeNode.
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You must set the TreeView.ShowNodeToolTips property of the parent System.Windows.Forms.TreeView to true for the TreeNode.ToolTipText to be visible at run time.
If the System.Windows.Forms.TreeView control has a ToolTip and also contains a System.Windows.Forms.TreeNode that has a System.Windows.Forms.ToolTip, only the System.Windows.Forms.ToolTip for the node will be shown.