TIWCGJQCheckBoxListOptions.OnUncheckall Property
Fires when all the options are all unchecked by either clicking the "uncheck all" link in the header, or when the "uncheckall" method is programatically called.
published property OnUncheckall: TIWCGJSonFunc index 18 read GetFuncValue write SetFuncValue stored IsFuncStored;