public string ExtraCheckBoxText { get; set; }

Public Property ExtraCheckBoxText As String
	Get
	Set

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

If ExtraCheckBoxText is set, a checkbox with the text will be shown. You can get the response of checkbox by checking the return value of the WasExtraCheckBoxChecked() method.