custom dialog alert dialog builder

AlertDialog.Builder builder=new AlertDialog.Builder(this);

         LayoutInflater inflater = getLayoutInflater();

            // Inflate and set the layout for the dialog
            // Pass null as the parent view because its going in the dialog layout
         View view=inflater.inflate(R.layout.custom_dialog, null);
         builder.setView(view);

        Dialog dialog = builder.create();
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);

        Button btnPositive=(Button) view.findViewById(R.id.btnPositive);
        Button btnNegative=(Button) view.findViewById(R.id.btnNegative);
        Button btnNeutral=(Button) view.findViewById(R.id.btnNeutral);

        TextView txvTitle=(TextView)view.findViewById(R.id.title);
        TextView txvMessage=(TextView)view.findViewById(R.id.message);