func SetWindowRefCon(windowId WindowID, ref interface{}) { id := (*C.char)(C.XPLMGetWindowRefCon(C.XPLMWindowID(windowId))) windows[id].Ref = ref }
func GetWindowRefCon(windowId WindowID) interface{} { id := (*C.char)(C.XPLMGetWindowRefCon(C.XPLMWindowID(windowId))) return windows[id].Ref }