Get vApp Status by vCloud SDK

Is anybody know how to check vApp status by vCloud SDK?

I noticed that vCloud SDK provides GetVAppStatus() method, but this method may return wrong status of a vApp and it's not enough to trace vApp status in my application.

For example:

1. If an vApp occurs an error when deploying or undeploying, the GetVAppStatus() will return POWEROFF instead of FAILING.

2. This method does not provide status of vApp like under deploying, deleting etc. When vApp is in that status, GetVAppStatus() will return BUSY. It is hard to track vApp status indeed without I log the vApp form status.

Is anybody know what the solution to solve above requirements? Is there some other ways to get vApp status?

Thanks in advance!