InlineUIContainerExample.xaml

<!-- <SnippetInlineUIContainerExampleWholePage> -->
<FlowDocument xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

  <Paragraph>
    Text to precede the button...

    <!-- Set the BaselineAlignment property to "Bottom" 
         so that the Button aligns properly with the text. -->
    <InlineUIContainer BaselineAlignment="Bottom">
      <Button>Button</Button>
    </InlineUIContainer>
    Text to follow the button...
  </Paragraph>

</FlowDocument>
<!-- </SnippetInlineUIContainerExampleWholePage> -->