Sequence Diagram: how do I set the type to a lifeline

Hi,

I'm trying to make a sequence diagram but I'm having trouble setting the type of the object. I want to set it like: object : Object. The tool puts the : but in the name I can only set the name of the object, but not the type. Plus, I need it to be underlined because is an object, not a class.

How can I do this?

Thank you (and sorry for my rusty english)

This might not be the best answer but here is how I do it and a screenshot of the fields in use.

I imported my classes from my java code. This might not help you a lot, BUT in the print screen, you can see which fields are filled with what value to get the result, I understand, you want.