title: Beep sounds when pressing keys in a form
body: <p>I have three controls on my form - a texbox, button and a picturebox. After clicking a button, both textbox and button itself become inactive. Also I have and <code>Form1_KeyDown(object sender, KeyEventArgs e)</code> to send pressed buttons that will be displayed on picturebox, but for some reason everytime I press any key it beeps. I've noticed that it happens only with button and <code>TextBox</code> deactivated. Why is that happening and how do I press keys without that annoying beeps? </p>
  
  <p><code>e.SuppressKeyPress = true</code> is preventing the input of keys to control, I don't need that, I just need to rid of that sound (why is it there anyway, when I'm disabling two controls?)</p>
  
  <p>UPD: I think the problem is that <code>PictureBox</code> doesn't have a focus and also a <code>KeyDown</code> event. </p>