Using InlineUIContainer to mix text and a Button
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
HorizontalAlignment="Center" VerticalAlignment="Center">
<TextBlock>
aaa
<InlineUIContainer>
<Button Content="Control" />
</InlineUIContainer>
aaa
</TextBlock>
</Page>
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