MainWindow.xaml

<Window x:Class="WpfApplication6.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:c="clr-namespace:WpfApplication6"
        Title="MainWindow" Height="350" Width="525">
    <StackPanel VerticalAlignment="Center" HorizontalAlignment="Center">
        <c:UserControl1>
            <Border Margin="0,10,0,10" >
                <WrapPanel>
                    <TextBlock Foreground="Aqua">AAAA</TextBlock>
                    <TextBlock Foreground="BlanchedAlmond">xyz</TextBlock>
                </WrapPanel>
            </Border>
        </c:UserControl1>
        <c:UserControl1>
            <WrapPanel>
                <TextBlock Foreground="Aqua">AAAA</TextBlock>
                <TextBlock Foreground="BlanchedAlmond">xyz</TextBlock>
            </WrapPanel>
        </c:UserControl1>
    </StackPanel>
</Window>

UserControl.xaml

<UserControl x:Class="WpfApplication6.UserControl1"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <UserControl.ContentTemplate>
        <DataTemplate>
            <StackPanel Orientation="Vertical" HorizontalAlignment="Center">
                <TextBlock>-------</TextBlock>
                <ContentPresenter Content="{TemplateBinding Content}"/>
                <TextBlock>-------</TextBlock>
            </StackPanel>
        </DataTemplate>
    </UserControl.ContentTemplate>
</UserControl>