How to change my android custom actionbar overflowbutton scale? -

i want change image of actionbar overflow button, i've replaced custom image on following code:

<style name="apptheme" parent="theme.appcompat.light.darkactionbar">     <item name="actionoverflowbuttonstyle">@style/myactionitemoverflow</item> </style>  <style name="myactionitemoverflow" parent="widget.appcompat.actionbutton.overflow">     <item name="android:src">@drawable/actionbar_add_icon</item>     <item name="android:scaletype">centerinside</item>     <item name="android:layout_width">15dp</item>     <item name="android:layout_height">15dp</item> </style> 

but question how make image's scale fit actionbar? attributes android:scaletype, android:layout_width, android:layout_heightdoesn't works