For example,
<ClientPanel>
<DockPanel>
<PageControl ux:Name="PageControl" Active="page1" Height="50%" Dock="Top">
<Page Name="page1" Background="#00f">
<ActivatingAnimation>
<ScrollTo Target="ScrollView" Position="0,0"/>
</ActivatingAnimation>
</Page>
<Page Name="page2" Background="#0f0">
<ActivatingAnimation>
<ScrollTo Target="ScrollView" Position="0,1000"/>
</ActivatingAnimation>
</Page>
<Page Name="page3" Background="#f00">
<ActivatingAnimation>
<ScrollTo Target="ScrollView" Position="0,2000"/>
</ActivatingAnimation>
</Page>
</PageControl>
<ScrollView ux:Name="ScrollView" Height="50%" Dock="Bottom">
<StackPanel Background="#000">
<Grid>
<Each Count="300">
<Rectangle Height="200" Background="#fff" Margin="0,0,0,10"/>
</Each>
</Grid>
</StackPanel>
<ScrollingAnimation From="0" To="1000">
<Set PageControl.Active="page1"/>
</ScrollingAnimation>
<ScrollingAnimation From="1000" To="2000">
<Set PageControl.Active="page2"/>
</ScrollingAnimation>
<ScrollingAnimation From="2000" To="3000">
<Set PageControl.Active="page3"/>
</ScrollingAnimation>
</ScrollView>
</DockPanel>
</ClientPanel>
</App>```
This code have conflict `Set active page` with `ScrollTo`.