//Js portion
elFinder.prototype.i18.en.messages['cmdcustom'] = 'Create new custom folder';
            elFinder.prototype._options.commands.push('custom');
            elFinder.prototype.commands.custom = function () {
            this.disableOnSearch = !0,
            this.updateOnSelect = !1,
            this.mime = "directory",
            this.prefix = "Style name",
            this.exec = e.proxy(this.fm.res("mixin", "make"), this),
            this.shortcuts = [{
                pattern: "ctrl+shift+s"
            }],
            this.getstate = function () {
                return !this._disabled && this.fm.cwd().write ? 0 : -1
                }
            }

//C# portion in FileSystemDriver.cs
JsonResult IDriver.CustomMakeDir(string target, string name) {

            FullPath fullPath = ParsePath(target);
            DirectoryInfo newDir = Directory.CreateDirectory(Path.Combine(fullPath.Directory.FullName, name));
            JsonResult vr = Json(new AddResponse(newDir, fullPath.Root));
            string json = new JavaScriptSerializer().Serialize(vr);

            JsonResultModel jsm = Newtonsoft.Json.JsonConvert.DeserializeObject<JsonResultModel>(json);
            List<Added> listAddedObj = jsm.Data.Added;
            string newParenthash = listAddedObj.FirstOrDefault().Hash; List<string> folders =  new List<string> {"COST","MIN","MAX"};

            foreach(string folderName in folders){
                FullPath fullPathn = ParsePath(newParenthash); //ParseCustomPath
                DirectoryInfo newDirn = Directory.CreateDirectory(Path.Combine(fullPathn.Directory.FullName, folderName));
                JsonResult jr = Json(new AddResponse(newDir, fullPathn.Root));
                string jsn = new JavaScriptSerializer().Serialize(jr);
            }
            return vr;
        }