<Window x:Class="WpfApplication2.Window1"
    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"
    Title="Window1">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="30" />
            <RowDefinition />
        </Grid.RowDefinitions>
        <Button Content="Click me" Click="Button_Click"/>
        <telerik:RadGridView x:Name="RadGridView1" Grid.Row="1" />
    </Grid>
</Window>
