To send a tell

[Migerus]

finally managed to make it work.

The OnPress line is pretty simple:

beginchatinput "/tell %t "

That enough to start tell to a target.

Actually it plays line in chat - /tell %t yourtexthere, but it sends to your current target. It works better then "/tell parent.Name2.LocalText" because if name has prefix, like "hunter", first variant still works.
Thanks again for you help )