'宣言 Public MustInherit Class VirtualEarthSource Inherits NotifyObject Implements C1.FlexMap.INotifier, C1.FlexMap.INotify, C1.FlexMap.ITileSource
public abstract class VirtualEarthSource : NotifyObject, C1.FlexMap.INotifier, C1.FlexMap.INotify, C1.FlexMap.ITileSource