[fixed] Metro-style main menu.

res/drawable-mdpi/metro_background.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+ 
+  <!-- pressed -->
+  <item android:state_pressed="true" >
+    <shape>
+      <stroke android:width="1px" android:color="#000000" />
+      <gradient android:startColor="#bd7c0b" android:endColor="#8f5e08" android:angle="270" />
+    </shape>
+  </item>
+ 
+  <!-- focused -->
+  <item android:state_focused="true" >
+    <shape>
+      <stroke android:width="1px" android:color="#000000" />
+      <gradient android:startColor="#bd7c0b" android:endColor="#8f5e08" android:angle="270" />
+    </shape>
+  </item>
+ 
+  <!-- default -->
+  <item>
+    <shape>
+      <stroke android:width="1px" android:color="#000000" />
+      <solid android:color="#ee9c0e"/>
+    </shape>
+  </item>
+</selector>