drawable background dosnt work ..

[emadph]

hi
why drawable background dosnt work ...
in Xml looks fine..
but after Running ... button selector corners disappear
am i missing sth !?

<com.dd.processbutton.iml.ActionProcessButton
android:id="@+id/basket_stage3_factor_btn_off"
android:layout_width="wrap_content"
android:layout_height="@dimen/value_40dp"
android:layout_gravity="center"

                                android:background="@drawable/button_selector"

                                android:gravity="center"
                                android:text="@string/save"
                                android:padding="@dimen/value_2dp"
                                custom:pb_colorComplete="@color/btn_login"
                                custom:pb_colorProgress="@color/purple_progress"
                                custom:pb_textComplete="@string/Success_send_coupon"
                                custom:pb_textProgress="@string/Loading"
                                custom:pb_colorError="@color/red_error"
                            />