<telerik:RadWindow x:Class="TelerikWpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        Header="MainWindow" Height="300" Width="300">
    <Grid>
        
    </Grid>
</telerik:RadWindow>