ControlTemplates and style xaml file

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<Window x:Class="ControlTemplates.GradientButtonTest"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="GradientButtonTest" Height="280" Width="322"
    >
  <Window.Resources>
    <ResourceDictionary>
      <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="a.xaml"></ResourceDictionary>
      </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
  </Window.Resources>
  <StackPanel>
    <Button Margin="10" Padding="5" Click="Clicked" Name="cmdOne">A Simple Button with a Custom Template</Button>
    <Button Margin="10" Padding="5" IsEnabled="False" Click="Clicked" Name="cmdFour" >A Disabled Button</Button>
    <CheckBox Margin="10" Checked="chkGreen_Checked" Unchecked="chkGreen_Unchecked">Use Alternate Theme</CheckBox>
  </StackPanel>
</Window>
//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 ControlTemplates
{

    public partial class GradientButtonTest : System.Windows.Window
    {

        public GradientButtonTest()
        {
            InitializeComponent();
        }

        private void Clicked(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("You clicked " + ((Button)sender).Name);
        }

        private void chkGreen_Checked(object sender, RoutedEventArgs e)
        {
            ResourceDictionary resourceDictionary = new ResourceDictionary();
            resourceDictionary.Source = new Uri("a.xaml", UriKind.Relative);
            this.Resources.MergedDictionaries[0] = resourceDictionary;                
        }

        private void chkGreen_Unchecked(object sender, RoutedEventArgs e)
        {
            ResourceDictionary resourceDictionary = new ResourceDictionary();
            resourceDictionary.Source = new Uri("b.xaml", UriKind.Relative);
            this.Resources.MergedDictionaries[0] = resourceDictionary;                
        }
    }
}