Handler for new page popup?

When you are in the dashboard for a group, looking at the navigation, if you click the button to ‘add a top-level page or link’, then click the link to ‘create a new page’, there is a popup window to setup the title, template, url, SEO, etc. for the new page.

Is there a handler I can use in a module to grab and modify the buffer for the html content that will go into this popup window before it is displayed?

Thanks in advance,

-= G =-