Dialog box problem changing left icon

Dialog box problem changing left icon

Hello,

I created a dialog box with a header. In the header, by default, I have a icon on the left. When I click on this icon, it closes the dialog box. I would like to change the icon.

Do you have a solution ?

Thank you
  1. <div data-role="dialog" id="dialog">
     
        <div data-role="header"  data-theme="b">
            <h1>D&eacute;tails cong&eacute;</h1>
        </div>
        <div data-role="content" id="text"></div>
       
    </div>