Blocking A Thread To Wait For Callback

I have been reading the async design patterns on MSDN and the general idea makes sense to me but in practice it is proving to be more difficult. I am working on a project utilizing VMWARE VIX.

HTML Code: [url]. Each function such as connecting to a host server, retrieving properties, etc. can be executed in two different ways.

Connecting to a host using a blocking Wait:

Code:
Dim m_lib As New VixLib
Dim m_hostJob As VixCOM.IJob

[CODE]...

Code:
Dim m_lib As New VixLib
Dim m_hostJob As VixCOM.IJob
dim m_callback as VixCOM.ICallback

[CODE]...

The problem with the VIX SDK is that sometimes the functions never return, hanging the application. dblock.

HTML Code:[URL] came up with a library that specifies a timeout value. When the timeout runs out the method aborts and returns regardless whether it finished or not.

The callback method is an active wait where the code continues to execute. What I want to implement is a blocking wait with a timeout. The ICallback interface has one sub OnVixEvent(IJob,Integer,IVixHandle). This method is fired at least twice, first when some progress is posted and second when it is complete. The first call to this method can be one second after registering the callback or 30 seconds, so I can not rely on this method to block the main thread. how to create some kind of async result class that would block the main thread from executing until either a timer runs out or the OnVixEvent method returns an Operation Complete signal that also implements ICallback.