JS Error during calendar adding

[ajaxovic]

When you enable plugin, you can't add new calendar, because parameter "driver" is not passed into props attribute of button command. JS expect json there and got empty string => crash. So, I found function which add this props (calendar_ui.php, method calendar_create_menu), but this method is never called during render. If I uderstand it right, reason is that in template, you used roundcube:button, not roundcube:object. And here, I got stuck because I don't know roundcube. For a hot-fix, I filed props with json manually and it works. Maybe you know what to do...