title: remove focus from a button which was clicked
body: <p>When I click a button the focus is set to this button.</p>
  <p>How do I remove the focus from this button with WIN API in C++?</p>
  <p>I think maybe somehow with the <code>SendMessage</code> WIN API method it is possible to remove the focus from the button.</p>
  <p>I have only the handle of button, also I cannot access the parent window anymore.</p>
  <p>I know that almost everytime it is possible to use <code>::SetFocus</code>, but this time I cannot use it since I cannot access the window form even if I find the handle. So please suggest other solutions.</p>