title: RadioButtons and CheckBoxes not working properly on iOS and UWP
body: <p>I am working on a cross platform app using <code>Xamarin</code> in <code>Visual Studio 2015</code>. I am using <code>XLabs.Forms v2.3.0- pre 05</code> and I am having problems with <code>radio buttons</code> and <code>checkboxes</code>.</p>
  
  <p>Right now the <code>checkboxes</code> work fine on <code>UWP</code> but they won't show on <code>iOS</code>.</p>
  
  <p>The radio buttons, on <code>UWP</code> won't work at all while on <code>iOS</code> only the texts gets displayed </p>
  
  <p>See pictures below.</p>
  
  <p>This is my code for checkboxes:</p>
  
  <pre><code>&lt;ListView x:Name="lv_ReportQuestions"&gt;
            &lt;ListView.ItemTemplate&gt;
              &lt;DataTemplate&gt;
                &lt;ViewCell&gt;
                  &lt;StackLayout 
                    Orientation="Vertical"
                  &gt;
                    &lt;StackLayout Orientation="Horizontal" HorizontalOptions="FillAndExpand"&gt;
  
                      &lt;StackLayout WidthRequest="{Binding DisplayWidth}"&gt;
                        &lt;Label HorizontalOptions="FillAndExpand" Text="{Binding ItemName}" VerticalOptions="Center" LineBreakMode="WordWrap"/&gt;
                      &lt;/StackLayout&gt;
  
                      &lt;controls:CheckBox DefaultText="" WidthRequest="40" IsEnabled="false" IsVisible="true" Checked="true" HorizontalOptions="EndAndExpand"/&gt;
  
                    &lt;/StackLayout&gt;
                    &lt;Label HorizontalOptions="FillAndExpand" Text="{Binding SubText}" VerticalOptions="Center"/&gt;
                  &lt;/StackLayout&gt;
              &lt;/ViewCell&gt;
            &lt;/DataTemplate&gt;
          &lt;/ListView.ItemTemplate&gt;
  &lt;/ListView&gt;
  </code></pre>
  
  <p>This is my code for radio buttons:</p>
  
  <pre><code>&lt;Label Text="Radio Buttons"/&gt;
  
      &lt;Frame
          HorizontalOptions="FillAndExpand"
          VerticalOptions="CenterAndExpand"
          OutlineColor="#000000"
        &gt;
        &lt;controls:BindableRadioGroup x:Name="ansPicker"
                                     IsVisible="true"/&gt;
      &lt;/Frame&gt;
  
  ansPicker.ItemsSource = new[]
          {
              "Red",
              "Blue",
              "Green",
              "Yellow",
              "Orange"
          };
  </code></pre>
  
  <p>I have tried to follow other possible fixes, but nothing worked for me.</p>
  
  <p><a href="https://i.stack.imgur.com/5ySjX.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5ySjX.jpg" alt="UWP"></a>
  <a href="https://i.stack.imgur.com/FX2eY.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/FX2eY.jpg" alt="iOS"></a></p>