通过属性和事件模型实现的完整的地图控件。

Fully implemented map control with property and event model.

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地图资源项使用这个信息和地图控件的显示范围来决定哪一个缓存瓦片需要重新获取。

The map resource item uses this information along with the Map control extent to determine which cache tiles need to be retrieved.

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定制的地图控件：除了Google的Map Controls之外，现在还可以使用Googles gcontrol类创建定制的控件。

Custom map controls: in addition to Google's map controls, it is now possible to create custom controls using Googles GControl class.

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