@Ratzz Sorry i can not check your answer as solved answer, Qt forum has a bug about that. I solved my problem, i've already read the topic that you linked here but after you posted it then a read again and i solved my problem thank you, but even so trying to give more explanatory answers is a good way because i like this forum and i want to see answers from another angles, another perspectives. When i get experienced at Qt i want to give good answers too. :)
And thank you so much Mr. @dheerendra . I think approach with row is a better way but i was need to a quick way so that stackoverflow link helped me about that.