WPF

namespace WpfDataTemplate
{
    public class Rung : UIElement
    {
        public int RungNumber { get; set; }
    }
}

<Window x:Class="WpfDataTemplate.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        xmlns:local="clr-namespace:WpfDataTemplate" 
        Title="MainWindow" Height="350" Width="525">
    <StackPanel>
        <StackPanel.Resources>
            <DataTemplate DataType="{x:Type local:Rung}">
                <Grid VerticalAlignment="Top" MinHeight="60" MinWidth="175">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="75"/>
                        <ColumnDefinition MinWidth="175"/>
                    </Grid.ColumnDefinitions>
                    <TextBlock Grid.Column="0" x:Name="number" Text="{Binding RungNumber}"
                               HorizontalAlignment="Center" VerticalAlignment="Center"/>
                    <Path x:Name="LeftRail" Data="M0,0 L0,60" Stretch="Fill" Stroke="Blue" Width="1" HorizontalAlignment="Left" Grid.Column="1"/>
                    <Path x:Name="RightRail" Data="M0,0 L0,60" Stretch="Fill" Stroke="Blue" Width="1" HorizontalAlignment="Right" Grid.Column="1" Margin="0,0,10,0" />
                    <Path x:Name="Run" Data="M0,0 L10,0" Height="1" Stretch="Fill" Stroke="Blue" Grid.Column="1" VerticalAlignment="Top" Margin="0,30,10,0"/>
                </Grid>
            </DataTemplate>
            <local:Rung x:Key="newRung" />
        </StackPanel.Resources>

            <StackPanel Height="50" Orientation="Horizontal">
                <Button Height="24" Content="Add Rung"/>
            </StackPanel>
            <ContentControl Content="{StaticResource newRung}"/>

    </StackPanel>
</Window>

private void Button_Click(object sender, RoutedEventArgs e)
       {
           Rung r = new Rung {RungNumber = 1};
           RungSurface.Children.Add(r);
       }