The map entity Info_GameType is the key to specifyng the game mode your map is built for. It works with two other Console Variables: mp_gametype and mp_gametype_override.
These three elements, along with a couple of other flags, are used to decide which game mode to use on any specific map.
Note: Click on the pictures for a more hi-def version. :)
Info_GameType
In the properties of Info_GameType you can specify which game type to use: Deathmatch, Dual Flag CTF, Multi-Flag CTF, Co-Op Championship and King of the Hill. Note that not all game types are included here; I'll explain that later.
In the flags section the single, lonely flag sitting there needs to be enabled if your map supports the VIP game mode. Otherwise, if you select VIP mode from the server dialogue the game will not recognise the capability and you'll default right back to deathmatch.
Note that it is good practice to prefix your map DMV_ instead of DM_ if it supports the VIP mode.
