Customization: Overlayering and extensions https://ax.help.dynamics.com/en/wiki/customization-overlayering-and-extensions/
Customize model elements using extensions https://ax.help.dynamics.com/en/wiki/customize-model-elements-using-extensions/
AX7: Overlayering and extensions
原文：http://www.cnblogs.com/dingkui/p/6226192.html