Hi Cavan,
Sorry for the late reply as I away on a holiday. Anyway, I found the solution to this. For anyone else having the same problem, you can do the following..
Open the Notepad and type the following, and afterwards, save it as ShowDesktop.vbs
Set Shell = CreateObject ("Shell.Application")
Shell.ToggleDesktop
Set Shell = Nothing
Now, just drag this file from your windows explorer into the ObjectDock tab and it should work.
Goodluck