footer row style cannot be applied

[Hans]

Hi,
I have some troubles with styling footer row for RadGridView. I create RadGridView in XAML and apply my custom style for footer row like this:

<telerik:RadGridView
     ...
     ShowColumnFooters="True"
     ...
     FooterRowStyle="{StaticResource footerRowStyle}">
</telerik:RadGridView>

and the style itself is:

<Style x:Key="footerRowStyle" TargetType="telerik:GridViewFooterRow">
    <Setter Property="BorderBrush" Value="#25A0DA"/>
    <Setter Property="BorderThickness" Value="0,1,0,0"/>
</Style>

which is located in the <UserControl.Resources>.
If I do not override FooterRowStyle, I can see footer row and aggregate results on it but when I apply my custom style, footer row disappears from grid. By the way I hadn't experienced such behaviour with Q1 2012.

I use Silverlight 5.0.61118.0, telerik assemblies of version 2012.2.607.1050, VS2010 Professional  SP1.

[Hans]

Up! Can you help me? How should I style grid footer row?