Page background in frame not working
<p>I have main page:</p>

<pre><code> &lt;Page   &gt;
    &lt;Grid&gt;
        &lt;SplitView PaneBackground="Transparent"  x:Name="mySplitView" DisplayMode="Overlay"  IsPaneOpen="{Binding IsOpenMenu, Mode=TwoWay}"   OpenPaneLength="320"&gt;
            &lt;SplitView.Pane&gt;
               ...
            &lt;/SplitView.Pane&gt;
            &lt;SplitView.Content&gt;
                &lt;Grid&gt;
                    &lt;Frame x:Name="frame"
                   Margin="0,0,0,0"&gt;
                        &lt;Frame.ContentTransitions&gt;
                            &lt;TransitionCollection&gt;
                                &lt;NavigationThemeTransition&gt;
                                    &lt;NavigationThemeTransition.DefaultNavigationTransitionInfo&gt;
                                        &lt;EntranceNavigationTransitionInfo/&gt;
                                    &lt;/NavigationThemeTransition.DefaultNavigationTransitionInfo&gt;
                                &lt;/NavigationThemeTransition&gt;
                            &lt;/TransitionCollection&gt;
                        &lt;/Frame.ContentTransitions&gt;
                    &lt;/Frame&gt;                   
                &lt;/Grid&gt;
            &lt;/SplitView.Content&gt;
        &lt;/SplitView&gt;          

    &lt;/Grid&gt;
&lt;/Page&gt;
</code></pre>

<p>In Frame i load other page. Example Page1.
In Page1 set background: </p>

<pre><code>&lt;Page   Background="Red" &gt;
&lt;/Page&gt;
</code></pre>

<p>And this not working? Background is not Red. Why?</p>