[rmrector]

Is it possible to make a button on a custom window that has the same funcition as the "select artwork..." like skinners can do with the "artwork downloader"?

...

There sure is: replace "script.artwork.downloader" with "script.artwork.beef". Artwork Beef doesn't support music videos so you can remove that line, but you will want to add new lines with "mediatype=set" and "mediatype=episode". "mode=auto" runs the automatic process.

PHP Code:

<control type="button" id="9001">
                        <label>$LOCALIZE[31203]</label>
                        <onclick condition="Container.Content(tvshows)">XBMC.RunScript(script.artwork.downloader, mode=gui, mediatype=tvshow, dbid=$INFO[ListItem.DBID])</onclick>
                        <onclick condition="Container.Content(movies)">XBMC.RunScript(script.artwork.downloader, mode=gui, mediatype=movie, dbid=$INFO[ListItem.DBID])</onclick>
                        <onclick condition="Container.Content(sets)">XBMC.RunScript(script.artwork.downloader, mode=gui, mediatype=set, dbid=$INFO[ListItem.DBID])</onclick>
                        <onclick condition="Container.Content(episodes)">XBMC.RunScript(script.artwork.downloader, mode=gui, mediatype=episode, dbid=$INFO[ListItem.DBID])</onclick>
                        <description>Get Artwork</description>
 </control>