title: How to change the up button colour in Navigation Architecture Component
body: <p>Here is my styles code</p>
  
  <pre><code>&lt;!-- Base application theme. --&gt;
  &lt;style name=&quot;AppTheme&quot; parent=&quot;Theme.AppCompat.DayNight.DarkActionBar&quot;&gt;
      &lt;!-- Customize your theme here. --&gt;
      &lt;item name=&quot;colorPrimary&quot;&gt;@color/lightGrey&lt;/item&gt;
      &lt;item name=&quot;colorPrimaryDark&quot;&gt;@color/black&lt;/item&gt;
      &lt;item name=&quot;colorAccent&quot;&gt;@color/grey&lt;/item&gt;
      &lt;item name=&quot;colorControlNormal&quot;&gt;@color/lightGrey&lt;/item&gt;
  &lt;/style&gt;
  
  &lt;style name=&quot;TextAppearance.AppCompat.Widget.ActionBar.Title&quot;
      parent=&quot;@android:style/TextAppearance&quot;&gt;
      &lt;item name=&quot;android:textColor&quot;&gt;@color/mediumBlack&lt;/item&gt;
  &lt;/style&gt;
  </code></pre>
  
  <p>and here is the navigation UI code</p>
  <pre><code>val myNavController = this.findNavController(R.id.myNavHostFragment)
  NavigationUI.setupActionBarWithNavController(this, myNavController)
  </code></pre>
  <p>Text changing colour works fine at style name &quot;TextAppearance.AppCompat.Widget.ActionBar.Title&quot;
  but I want to change the colour of the upButton.
  Its showing white by default, I want to change it to black.</p>