title: Open Form2 from Form1, close Form1 from Form2
body: <p>Now, I have two forms, called form1 and form2, in the form1 there's a button, when I click it, then open the form2</p>
  
  <p>Question: in the form2, I want to create a button when I click it, the form2 close and the form1 close. How to do?this</p>