This VB application user interface consists mainly of control, and the composition of the kit provides only 21 standard controls. Obviously, only use these controls write complicated application is difficult. Therefore, it is necessary to the VB function expansion and its approach has three main types: , using VB and third-party developers for users provide large amounts of ActiveX controls. They are VB toolbox extended, can greatly enhance the VB programming function. , use OLE technology. Can other Windows application object, such as Word doc, Excel illustrations etc insert VB app, thereby enhancing the VB and other applications to share and data transmission ability. , call system API functions. API is Windows environment for any Windows application procedure call a set of functions, which can call these functions systematically control operation.

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