Gets the control for which the System.Windows.Forms.ToolTip is being drawn.
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Because the System.Windows.Forms.ToolTip can be associated with multiple controls through the ToolTip.SetToolTip(Control, string) method, the DrawToolTipEventArgs.AssociatedControl property can be used to determine which control the ToolTip.Draw event is associated with. This is helpful if you want to perform different ToolTip customization based on the associated control.