The popup appearance I like better than the conventional UI dialog. But Boxy seems to do wierd things with the <head> for AJAX-supplied dialog content. Each tag of the header makes a blank line in the dialog.
When I use the 'filter' to try filtering down to the actual content in the content, it never appears. The Boxy examples seem to ignore this trait, having empty <head> sections. Stepping through the boxy code with firebug shows the 'html' being markedly different when the header is empty vs when it is not. It doesn't appear the boxy developer is still maintaining it, as the boxy google group contains nothing but a dozen spam messages.