title: TextBox TextChanged event fired issue when MainWindow load event exist
body: <p>Following picture shows what my project is.</p>
  
  <p><a href="https://i.stack.imgur.com/ZrQwc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ZrQwc.png" alt="My project"></a></p>
  
  <p>Here is the my project codes for your testing needs.</p>
  
  <pre><code>&lt;Window x:Class="MainWindow"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="MainWindow" Height="150" Width="400"&gt;
  &lt;Grid&gt;
      &lt;TextBox Name="TextBox1" Width="200" Height="30" HorizontalAlignment="Left" Background="Pink" /&gt;
      &lt;Button Name="Button1" Content="Button1" Width="125" Height="30" HorizontalAlignment="Right" IsEnabled="False" /&gt;
  &lt;/Grid&gt;
  &lt;/Window&gt;
  </code></pre>
  
  <p>...</p>
  
  <pre><code>Class MainWindow 
  
  Private Sub MainWindow_Loaded(sender As Object, e As System.Windows.RoutedEventArgs) Handles Me.Loaded
      TextBox1.Text = "Hello"
  End Sub
  
  Private Sub TextBox1_TextChanged(sender As System.Object, e As System.Windows.Controls.TextChangedEventArgs) Handles TextBox1.TextChanged
      Button1.IsEnabled = True
  End Sub
  
  End Class
  </code></pre>
  
  <p>When I run the codes above TextBox1_TextChanged event fired because of MainWindow_Loaded event.</p>
  
  <p>Do you have any idea how to fire TextBox1_TextChanged event after MainWindow_Loaded?</p>