Change OuterGlowBitmapEffect for a Button
<Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="" Height="120" Width="240"> <Window.Resources> <Style TargetType="{x:Type Button}"> <Style.Triggers> <Trigger Property="IsMouseOver" Value="True"> <Setter Property="BitmapEffect"> <Setter.Value> <OuterGlowBitmapEffect GlowColor="Orange" GlowSize="5"/> </Setter.Value> </Setter> </Trigger> </Style.Triggers> </Style> </Window.Resources> <StackPanel Margin="8"> <Button Height="25" Width="100" Margin="4"> Mouse Over Me! </Button> </StackPanel> </Window>