Tizen Developers

I have tried to implement index in a layout with naviframe. When I use naviframe, index dots positioned down from the top. Do I inevitably need a custom edc file to implement index? I also want to understand the relationship between elm_layout_theme_set and edc file. I read through the API reference but I could not find enough information. There were no explanations about basic styles(ex. "layout", "application", "default") and parts names, etc.