<Window x:Class="Styles.EventTriggers" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="EventTriggers" Height="300" Width="300"> <Window.Resources> <Style x:Key="BigFontButton"> <Style.Setters> <Setter Property="Control.FontSize" Value="18" /> <Setter Property="Control.FontWeight" Value="Bold" /> </Style.Setters> <Style.Triggers> <EventTrigger RoutedEvent="Mouse.MouseEnter"> <EventTrigger.Actions> <BeginStoryboard> <Storyboard> <DoubleAnimation Duration="0:0:0.2" Storyboard.TargetProperty="FontSize" To="22" /> </Storyboard> </BeginStoryboard> </EventTrigger.Actions> </EventTrigger> <EventTrigger RoutedEvent="Mouse.MouseLeave"> <EventTrigger.Actions> <BeginStoryboard> <Storyboard> <DoubleAnimation Duration="0:0:1" Storyboard.TargetProperty="FontSize" /> </Storyboard> </BeginStoryboard> </EventTrigger.Actions> </EventTrigger> </Style.Triggers> </Style> </Window.Resources> <StackPanel Margin="5"> <Button Padding="5" Margin="5" Style="{StaticResource BigFontButton}">A Customized Button</Button> </StackPanel> </Window>