'宣言 Protected Overridable Function OnBeforeDisplayToolTip( _ ByVal ultraControl As Infragistics.Win.IUltraControl, _ ByVal element As Infragistics.Win.UIElement, _ ByRef toolTipInfo As Infragistics.Win.ToolTipInfo, _ ByVal trigger As ControlUIElementBase.ToolTipTrigger _ ) As Boolean
protected virtual bool OnBeforeDisplayToolTip( Infragistics.Win.IUltraControl ultraControl, Infragistics.Win.UIElement element, ref Infragistics.Win.ToolTipInfo toolTipInfo, ControlUIElementBase.ToolTipTrigger trigger )