title: How to highlight the selected item in an MvxListView
body: <p>How can I keep an item, in an <code>MvxListView</code>, highlighted until it is unselected or until another item is selected?</p>
  
  <p>My program has an <code>MvxListView</code> that correctly displays a list of items.  The user can select an item, by clicking it, and then click a save button.  The selected item is stored in <code>MyChosenItem</code> until it is needed by the save button code.  Currently, the selected item stays highlights for a split second before returning to the unselected color.  </p>
  
  <p>This is how the <code>MvxListView</code> is created:</p>
  
  <pre><code>&lt;Mvx.MvxListView
      android:layout_width="match_parent"
      android:layout_height="260dp"
      android:layout_marginTop="40dp"
      android:id="@+id/MyMvxListViewControl"
      local:MvxBind="ItemsSource MyItems; SelectedItem MyChosenItem"
      local:MvxItemTemplate="@layout/my_item_layout" /&gt;
  </code></pre>
  
  <p>This is <code>Layout/my_item_layout.xaml</code>:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:local="http://schemas.android.com/apk/res/Project.Ui.Droid"
      android:orientation="horizontal"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"&gt;
      &lt;TextView
          android:layout_width="300.0dp"
          android:layout_height="wrap_content"
          android:padding="5dp"
          android:textSize="20dp"
          android:textColor="#000000"
          local:MvxBind="Text Field1" /&gt;
      &lt;TextView
          android:layout_width="250.0dp"
          android:layout_height="wrap_content"
          android:padding="5dp"
          android:textSize="20dp"
          android:textColor="#000000"
          local:MvxBind="Text Field2" /&gt;
  &lt;/LinearLayout&gt;
  </code></pre>