title: How to determine has Component active LoadMask or not?
body: <p>I have a window and a form inside which is putting LoadMask on its submit. While submitting process I catch <code>ESC</code> key pressing on window not to allow user to close it during form submit.</p>
  
  <p>How to determine has form active LoadMask or not?</p>
  
  <p>Maybe something like stores <code>isLoading()</code> method?</p>