i couldnt do what i want with this style. So i decided to change my method.
I want to populate my multiple-selection items, i googled it a lot but i cant get result which is useful for me.
So now, i have a textbox and a button. Textbox is txtSearch, button is btnSearch. When i type something in textbox and press btnSearch, multiple selection listbox should populate, in infopath. Maybe we can do this via coding, but in my company i dont have chance to code coz company's pc dont have visual studio :)) and dont let me to install it :)