Hi, I want to add a class in the error/information message popup window that will be dynamic based on a custom theme attribute in the application. For overview and new/edit pages I have implemented this functionality by adding a JS in the layout that checks the theme attribute value and adds a class (below is example of new/edit page with theme-custom added) . Is there any way to add same functionality in the dialog message? As there is no layout that I can find that the dialog box uses. Thanks to all in advance.