WPF C#

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WpfApplication1" Height="231" Width="544" WindowStartupLocation="CenterScreen">
  
    
      
        
          
        

      
    
    
      
      
      
    
    
      
        
          
          
        
      

    
  

  
            SelectionChanged ="comboStyles_Changed" />
          Height="40" Width="100" Click ="btnMouseOverStyle_Click">My Button
  


//File:Window.xaml.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
namespace WpfApplication1
{
  public partial class MainWindow : Window
  {
    public MainWindow()
    {
      InitializeComponent();
      lstStyles.Items.Add("TiltStyle");
      lstStyles.Items.Add("GreenStyle");
      lstStyles.Items.Add("MouseOverStyle");
    }
    protected void comboStyles_Changed(object sender, RoutedEventArgs args)
    {
      System.Windows.Style currStyle = (System.Windows.Style)FindResource(lstStyles.SelectedValue);
      this.btnMouseOverStyle.Style = currStyle;
    }
    protected void btnMouseOverStyle_Click(object sender, RoutedEventArgs args)
    {
      MessageBox.Show("Clicked");
    }
  }
}