before you opening the vmf files
extract all the files to the folder: C:\Program Files\Steam\steamapps\common\portal 2\sdk_content\maps
then you can open the vmf

include my own instances, that didn't have there.
i will add more useful instances.

Screenshot: http://www.mediafire.com/imageview.php? ... 21&thumb=6
enjoy the panel stairs

and if you have any questions you can add me and ask in the steam my id: dimakeeper or post here in the topic.

File Name: panel_stairs_example.rar
File Size: 13.36 KiB