How to set activation line on sequence diagram

[Kosmopolita]

Hi everybody,

I'm asking for help with a simple sequence diagram. Activation line going down from one of classes starts right from bottom of the class (that's what I don't want). Activation lines on other classes start after first incoming message to the lifeline (that's what I prefer). I want all activation lines to start just after first incoming message to that lifeline. Does anybody know what to set up?
(No, rclick-Activations-Extend Source Activation Up is unchecked on first and any other outgoing messages.)

Thanks in advance, Kosmo