public ClientDropController(ModelsEx models)
        {
            this.models = models;
            var dxHost = models.Window.Window.BorderHost;

            dxHost.DragOver += (o, args) => args.Effects = DragDropEffects.Copy;
            dxHost.AllowDrop = true;
            dxHost.Drop     += DxHostOnDrop;

            import = new ImportDialogController(models);
        }