I did do a search for this, and I don't think this has been brought up before. If it has, I have poor search skills, or rather, the search engine has poor search skills :D
My suggestion is that you add some more of the VB.NET keywords to the array of keywords used for the VBCODE tags.
For Example, (off the top of my head)
VB Code:
Try Catch Finally Shadows Inherits Imports Throw
and many more...
