MARKUS

<Window xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"  x:Class="TEST_WPF.Window1"

        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:local="clr-namespace:TEST_WPF"

        mc:Ignorable="d"

        Title="Window1" Height="300" Width="300">

    <Grid>

    </Grid>

</Window>