preview

Preview functionality is known feature of many publishing systems: it's intended to show exactly how your content will look like before publishing. With nodes displayed in Panel Pages there is issue that panel layout can be quite complex, and sometimes you can't have same display in Panel Page and in preview (without spending too much effort). Basically, to have same display one would have to code that complex layout in node template too, in addition to Panel lauout template, or have some way to render Panel display in preview.
How do you solve that problem ?
Is it possible to render Panel page in preview in place of node template ?

Hello guys,
I'm very glad to see you here.

The problem I came across is: I need to develop a CMS for the admin. The admin has several sites to handle, each site having its own theme. The admin requires a simplified theme when he manages these sites. So I creat a light one and put it into the sites/all/theme/ folder.

But now, the admin says when he 'preview' the node in the 'edit' page, the node and its original theme should be present. In other words, the 'preview' window should take an another theme that different from the current one the admin uses.