TIWCGJQGridOptions.OnSubGridBeforeExpand Property
The event is raised just before expanding the grid. When set, this event should return true or false. If it returns false the subgrid row is not expanded and the subgrid is not opened.
published property OnSubGridBeforeExpand: TIWCGJSonFunc index 122 read GetFuncValue write SetFuncValue stored IsFuncStored;