Valve's new update tool; rumor is everything will be migrating to this platform.
More info: https://developer.valvesoftware.com/wiki/SteamCMD
To use it in the panel simply run steamcmd directly, and use a commandline similar to the one below. Note the +exit is required. Quote options that have spaces.
Note, with csgo and Valve's srcds you can just use anonymous as your username and no password.
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+login <username> <password> +force_install_dir C:\Servers\CSGO +app_update 740 validate +exit
Nothing special is really required. Run the executable directly, and use a command line like you'd typically use in a batch file or at the command shell.
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-command update -game "Counter-Strike Source" -dir C:\Servers\CSS -verify_all