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Change control background in mouse enter and leave

<Window x: Class="Styles.EventSetter"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="EventSetter" Height="300" Width="300">   <Window.Resources>     <Style x:Key="MouseOverHighlightStyle">       <Setter Property="TextBlock.Padding" Value="5"/>       <EventSetter Event="FrameworkElement.MouseEnter" Handler="element_MouseEnter" />       <EventSetter Event="FrameworkElement.MouseLeave" Handler="element_MouseLeave" />     </Style>   </Window.Resources>      <StackPanel>     <TextBlock Style="{StaticResource MouseOverHighlightStyle}">Hover over me.</TextBlock>     <TextBlock Padding="5">asdf</TextBlock>     <TextBlock Style="{StaticResource MouseOverHighlightStyle}">Hover over me.</TextBlock>   </StackPanel> </Window> //File:Window.xaml.vb Imports System Imports System.Collections.Generic Imports System.Text Imports System.Windows Imports System.Windows.Controls Imports System.Windows.Data Imports System.Windows.Documents Imports System.Windows.Input Imports System.Windows.Media Imports System.Windows.Media.Imaging Imports System.Windows.Shapes Namespace Styles   Public Partial Class EventSetter     Inherits System.Windows.Window     Public Sub New()       InitializeComponent()     End Sub     Private Sub element_MouseEnter(sender As Object, e As MouseEventArgs)       DirectCast(sender, TextBlock).Background = New SolidColorBrush(Colors.LightGoldenrodYellow)     End Sub     Private Sub element_MouseLeave(sender As Object, e As MouseEventArgs)       DirectCast(sender, TextBlock).Background = Nothing     End Sub   End Class End Namespace