ModifyView related issue

Dear Experts,

I would like to have a comprehensive understanding regarding the hook method modifyView.

Question may be:

1 When is modifyView be called?

Background: in a WD component, a couple of WD components are embedded in. It is found that some interface view's modifyView will be called. But it seems there is no direct triggering. Can anyone explain this?

2 Modifyview method may be called twice?

In debugger call stack, I found sometimes modifyView is called twice!

Questions may not be listed completely. Hope someone can give me some further help in understanding.

Thanks