I tried everything to fix my dock which had missing Finder and Trash icons, no separator and no right-click function. I tried deleting the com.apple.dock.plist files, the killall Dock, the Candybar download…and still nothing worked. Well if this is your case, hopefully your worries will be over:
- Go to another mac and locate the following: Macintosh HD > System > Library > Core Services > Right click dock > Show Package Contents > Contents.
- Copy all the files and folders in the contents folder.
- Do step 1 again on you mac, and paste the contents contents over your files.
- Should be no need, but if no change, open Terminal and type killall Dock
- If problem still persists, find the following on another mac and replace it on yours : Macintosh HD > Library > Preferences > com.apple.dock.plist.
- Then type killall Dock in your terminal again.
If the problem still persists 1. Look for other solutions online or, 2. Wait for Snow Leopard 
Hope that helps 
Filed under: Mac Related , Dock
