title: Why "Buttons in button bars should be borderless" in Android API Level 15?
body: <p>I'm developing an application for Android and I recently changed the API level target from 8 to 15, and now Eclipse is warning me when the <code>Buttons</code> are inside <code>Linear Layouts</code> or <code>Table Rows</code>.</p>
  
  <p>The same doesn't happen when the <code>Button</code> is in a <code>Relative Layout</code>.</p>
  
  <p>The warning says: </p>
  
  <blockquote>
    <p>Buttons in button bars should be borderless; use
    style="?android:attr/buttonBarButtonStyle" (and
    ?android:attr/buttonBarStyle on the parent)</p>
  </blockquote>
  
  <p>I can get rid of the warning by following the suggestion or even by suppressing it, but I'm interested to know why this now? What's wrong with bordered buttons?</p>