fix of #614

Author: AJIXuMuK

src/controls/folderPicker/index.ts

@@ -1,3 +1,4 @@
 export * from './FolderPicker';
 export * from './IFolderPickerProps';
 export * from './IFolderPickerState';
+export { IFolder } from '../../services/IFolderExplorerService';