title: Trouble positioning customized thumb at the centre of seekbar
body: <p>I tried to change the width of seekbar and made it thin. But my thumb is not coming at the centre of seekbar. Thumb is a customised 9 patch image.</p>
  
  <pre><code>    &lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:orientation="vertical"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
   &gt;
   &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:id="@+id/relLayout"
          android:orientation="horizontal"
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          android:layout_alignParentBottom="true"
  &gt;
      &lt;SeekBar 
          android:paddingLeft="60dp" 
          android:progressDrawable="@drawable/seekbar_progress" 
          android:progress="0" 
          android:layout_height="20dp" 
          android:layout_width="fill_parent" 
          android:id="@+id/frequency_slider" 
          android:max="1" 
          android:paddingRight="60dp" 
          android:minWidth="60dp"
          android:minHeight="60dp"
          android:layout_alignParentRight="true"
  
          android:thumb="@drawable/seek_normal_thumb" &gt;
          &lt;/SeekBar&gt;
  
  
  
  &lt;/RelativeLayout&gt;
  &lt;WebView  xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@+id/webkit"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_above="@+id/relLayout"
      android:layout_alignParentTop="true"
  /&gt;
  &lt;/RelativeLayout&gt;
  </code></pre>