title: How to remove material shadow from ToggleButton?
body: <p>Today I've faced a problem: </p>
  
  <p>In my custom layout there are LinearLayout with grey background and ToggleButton right after TextView inside this LinearLayout. 
  Toggle button have transparent background. 
  But in android Lollipop here are unnecessary shadow.
  I've tried elevation=0dp attribute. But this did't fixed my problem.</p>
  
  <p>This happens when I'm set api = 21</p>
  
  <p><img src="https://i.stack.imgur.com/5p4DC.png" alt="enter image description here"></p>
  
  <p>And happens this on older apis &lt; 21</p>
  
  <p><img src="https://i.stack.imgur.com/Ix9bW.png" alt="enter image description here"></p>
  
  <p>Here is the sample layout:</p>
  
  <pre><code>&lt;LinearLayout
      android:layout_width="match_parent"
      android:layout_height="45dp"
      android:orientation="horizontal"
      android:background="@color/grey_light"&gt;
  
      &lt;TextView
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="0123" /&gt;
  
      &lt;ToggleButton
          android:layout_width="wrap_content"
          android:layout_height="match_parent"
          android:background="@android:color/transparent"
          android:button="@android:color/transparent" /&gt;
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>How to remove this shadow?</p>