GM:ForceDermaSkin
Description
Called to allow override of the default Derma skin for all panels.
This hook is only called on Lua start up, changing its value (or adding new hooks) after it has been already called will not have any effect.
Returns
1 string
A case sensitive Derma skin name to be used as default, registered previously via derma.DefineSkin.
Returning nothing, nil or invalid name will make it fallback to the "Default" skin.