From MSFlexGrid Control:
Note
Before you can use an MSFlexGrid in your application, you must add the MSFlxGrd.ocx file to your project. To automatically include the file in your project, put it in the Autoload file. When distributing your application, you should install the MSFlxGrd.ocx file in the users Microsoft Windows System directory. For more information about adding an ActiveX control to a project, see "Standard ActiveX Controls" in the Visual Basic Programmers Guide.