Making UML sequence diagram in VS 2010RC I've observed that there is no activation rectangle in first object. Is this correct? Not according to my tutor and I have to quote him:
"Finally, you have no activation rectangle for the userInterface instance, so the initial message could never have been sent."

But I'm thinking that if guys from VS did that it must/should be correct.

Another thing he is picking me at is and I'm quoting him:
"In class diagram the generalisation arrow heads should be open triangles."
In my opinion there isn't strictly said that they must be open triangles especially when software lets you choose their form. Looking forward to hear your opinions.

Thanks for answers.