<ListBox Name="lvContainer" Margin="5" ItemsSource="{Binding}" HorizontalContentAlignment="Stretch" Background="AntiqueWhite">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <StackPanel>
                            <Expander Name="expender" Header="{Binding Path=Param1}" FontSize="16" FontWeight="Bold">
                                <Border Margin="3" Background="LightGray" BorderThickness="5" BorderBrush="Gray">
                                    <StackPanel>
                                        <RichTextBox x:Name="content">
                                            <FlowDocument>
                                                <Paragraph>
                                                    <ItemsControl ItemsSource="{Binding Path=Param2}"/>
                                                </Paragraph>
                                            </FlowDocument>
                                        </RichTextBox>
                                    </StackPanel>
                                </Border>
                            </Expander>
                        </StackPanel>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>