hello i'm trying to add style which change radnumericupdown background when it got the focus but this doesn't work
<Style TargetType="{x:Type telerik:RadNumericUpDown}" >
<Style.Triggers>
<Trigger Property="IsFocused" Value="true">
<Setter Property="Background" Value="#FEFCD7" />
</Trigger>
<Trigger Property="IsFocused" Value="false">
<Setter Property="Background" Value="White"/>
</Trigger>
</Style.Triggers>
</Style>