title: How to change mdi statusstrip label from a child form
body: <p>I've been searching for a solution for couple of days now, but can't find a simple answer.
  I've tried a number of examples found on internet (delegates, properties, even breaking OOP making everything public) but none of these seem to work.
  Can someone please write a simplest possible code for the following problem:</p>
  
  <p>I have MDI parent form, and a child form. MDI parent form has a status-strip label. Child form has a button. All I want to do is update the MDI label on click of child form button.</p>
  
  <p>Thanks!!!</p>