<FlowDocument ColumnWidth="400">
  <Paragraph Background="GhostWhite">
    <Run>
      A UIElement element may be embedded directly in flow content
      by enclosing it in an InlineUIContainer element.
    </Run>
    <LineBreak/>
    <LineBreak/>
    <InlineUIContainer>
      <Button>Click me!</Button>
    </InlineUIContainer>
    <LineBreak/>
    <LineBreak/>
    <Run>
      The InlineUIContainer element may host no more than one top-level
      UIElement.  However, other UIElements may be nested within the
      UIElement contained by an InlineUIContainer element.  For example,
      a StackPanel can be used to host multiple UIElement elements within
      an InlineUIContainer element.
    </Run>
    <InlineUIContainer>
      <StackPanel>
        <Label Foreground="Blue">Choose a value:</Label>
        <ComboBox>
          <ComboBoxItem IsSelected="True">a</ComboBoxItem>
          <ComboBoxItem>b</ComboBoxItem>
          <ComboBoxItem>c</ComboBoxItem>
        </ComboBox>
        <Label Foreground ="Red">Choose a value:</Label>
        <StackPanel>
          <RadioButton>x</RadioButton>
          <RadioButton>y</RadioButton>
          <RadioButton>z</RadioButton>
        </StackPanel>
        <Label>Enter a value:</Label>
        <TextBox>
          A text editor embedded in flow content.
        </TextBox>
      </StackPanel>
    </InlineUIContainer>
  </Paragraph>
</FlowDocument>