A base for all context menu panels ( The ones used for tool options in sandbox )
Derives methods, etc not listed on this page from Panel.
ContextBase:ControlValues( table contextData )
Called by spawnmenu functions (when creating a context menu) to fill this control with data.
Returns the ConVar for the panel to change/handle, set by ContextBase:SetConVar
You should override this function and use it to check whether your convar value changed.