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TChartPanelListeners Class

Maintains an interface list that only contains IChartPanelListeners and notifies the owner when things change

The TRSChartPanel and TRSCustomChart classes use this class to maintain the list of listeners interested in changes to their state.

	Name	Description
	Add(IChartPanelListener)	Adds the listener to the list and returns its index in the list. From this point forward, the listener's IChartPanelListener methods will be called as the state of the TRSChartPanel, the TRSCustomChart or its values change.
	BeginUpdate	Suspends notifications to the IChartPanelListeners until the EndUpdate method is called
	Change	Represents method Change.
	ChartAdded(TRSCustomChart)	Represents method ChartAdded(TRSCustomChart).
	ChartChanged(TRSCustomChart)	Represents method ChartChanged(TRSCustomChart).
	ChartDeleted(TRSCustomChart)	Represents method ChartDeleted(TRSCustomChart).
	EndUpdate	Resumes notifications to the IChartPanelListeners after the BeginUpdate method has temporarily suspended notifications
	SelectionChanged(TObject)	Represents method SelectionChanged(TObject).
	ValueChanged(TRSCustomChart,TRSChartValue)	Represents method ValueChanged(TRSCustomChart,TRSChartValue).
	VisibleChanged(TObject)	Represents method VisibleChanged(TObject).