<UserControl x:Class="StringFormatMVVM.Example"
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
            xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
            xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
            xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
            xmlns:local="clr-namespace:StringFormatMVVM"
            mc:Ignorable="d"
            d:DesignHeight="300" d:DesignWidth="400">
    <Grid>
       
        <telerik:RadDateTimePicker Grid.Column="1" Grid.Row="0" VerticalAlignment="Top" Margin="5 27"
            DisplayFormat="{Binding SelectedItem, ElementName=DateTimePickerFormat}"
            />
    </Grid>
</UserControl>