@mentalist
Problem comes down to this:
popup-menu closes if you touch screen outside of popup frame. Depending on where menu jumps up for me it tends to sometimes close itself when i start moving my finger. Quite likely I'm not the only one and I have adapted my usage behaviour to N900. If something works 95% of time then to end user it means that it's not usable.

Actually it seems that it works differently in main conversations view(menu closes if you move finger outside of box) and in conversations message view(works as it should imo).Hmmmm.Can someone confirm this?