[XAML]
<FlowDocument ColumnWidth="400">
<Section Background="GhostWhite">
<Paragraph>
A UIElement element may be embedded directly in flow content
by enclosing it in a BlockUIContainer element.
</Paragraph>
<BlockUIContainer>
<Button>Click me!</Button>
</BlockUIContainer>
<Paragraph>
The BlockUIContainer element may host no more than one
top-level
UIElement. However, other UIElements may be nested within the
UIElement contained by an BlockUIContainer element. For
example,
a StackPanel can be used to host multiple UIElement elements
within
a BlockUIContainer element.
</Paragraph>
<BlockUIContainer>
<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>
</BlockUIContainer>
</Section>
</FlowDocument>