Ignore first part of my question.... i only had to set Data property of master DataGrid to nalog (property that I set in DropDown.
I still have to find way to sort results in DropDown and to show more then one column.
I noticed that paging on master DataGrid not working properly. It always gives me 5 pages even if there is data for only two pages and if I select page number two, master DataGrid becomes gray and won't load data. Count property of master DataGrid is set to ${getViewParametriNalogasCount}