garrynewman/garrysmod — pull request #494 by Lexicality (2013-08-31 00:16:02+00:00)
Title: Allow ControlPanels to be spawned via ControlPanel:AddControl

It's pretty useful for sectioning bits of an unweildy tool, since ControlPanel is a souped up DForm which is in turn a souped up DCategoryCollapse.