Handling Origin Object Events

Event macros for origin object events include:

Macro	Description
ON_LAYER_DESTROY(_ocHandler)	When destroy one layer the function _ocHandleris run. _ocHandler has the prototype: BOOL ''_ocHandler''( Layer lay, DWORD dwCntrl );
ON_GROBJ_DESTROY(_ocHandler)	When destroy one graph object the function _ocHandleris run. _ocHandler has the prototype: BOOL _ocHandler( GraphObject go, DWORD dwCntrl );