Use the Source SDK tool Hammer Editor.
Yes, Source SDK Comes with all the source games
This is a well known problem in hammer editor. I recommend clicking "Refresh SDK Content" if that doesn't work click "Reset Game Configurations" and as a final resort change the engine version, or game in source SDK.
Source SDK is not avalile on he Xbox 360 consoles.If you own the PC Version of Left 4 Dead 2, you can access the Source SDK by going toLibrary> ToolsThen select "Left 4 Dead 2 Authorizing Tools".This is the Source SDK that is used for Left 4 Dead 2.If it is uninstalled, allow it to install as it wont take that long.Then double click it and when the screen for it comes up. Select the Hammer Editor Tool to make a map.
You can make a CS:S map by using Souce SDK's Hammer World Editor if you have a steam account and CS:S you already have SDK, to load it to your PC just go to your steam library, then to the tools section and under tools should be Source SDK once you download it (it shouldn't take as long a CS:S to download) go the the Hammer Editor icon and then design your map. If you need mapping help you can go to Interlopers.net or developer.valvesoftware.com, if you own HL or team fortress you can also make maps for those as well. Hope this helps :)
diagrm of sdk
Wii Opera SDK was created in 2007.
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The editor comes with the game it should be in the folder your game is installed in If you have steam you get the option to start the game or the editor But alone the editor cant be downloaded
SDK Planes Mod, I guess you could find it on Minecraft Forums
Source SDK's Hammer editor is used to make all valve produced games such as CS:S, HL2, Team Fortress, L4D and more Go to www.devloper.valvesoftware.com
Halo: Reach comes with a built-in map editor called Forge Mode. You can access this from the main menu of Reach.