Dialog
다이얼로그 버튼 확인,취소 디자인 적용
(dlg.findViewById(android.R.id.button1)).setBackgroundResource(R.drawable.control_button_basic);
(dlg.findViewById(android.R.id.button2)).setBackgroundResource(R.drawable.control_button_cancel);
android.R.id.button1 for positive,
android.R.id.button2 for negative,
android.R.id.button3 for neutra
