You can format any data label: {value} - will be replaced with value and so on. You can add your own text or html code too. ({value} {title} {percents} {axis} {description})

public string BalloonTextFormatString { get; set; }

Public Property BalloonTextFormatString As String

public:
property String^ BalloonTextFormatString {
	String^ get ();
	void set (String^ value);
}