ToolTip.Show Method (String, IWin32Window, Point)
Sets the ToolTip text associated with the specified control, and then displays the ToolTip modally at the specified relative position.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
The pt parameter can specify a position outside the bounds of the associated control, its parent form, or even the desktop. The version of the Show method displays the ToolTip for the specified control modally; that is, the ToolTip will be displayed until the Hide method is called, or until the parent form is minimized, hidden, or dismissed.