<script>
 
    var dhxWins = new dhtmlXWindows();
    ...
    // adding global event
    dhxWins.attachEvent("onFocus", function(win) {
        alert("global event 'onFocus' was catched");
    });
    // adding personal event
    dhxWins.window(id).attachEvent("onFocus", function(win) {
        alert("personal event 'onFocus' was catched");
    });</script>