Microsoft KB Archive/136848

= PRB: Class Browser: "Unable to Display Class Hierarchy" Error =

Article ID: 136848

Article Last Modified on 2/15/2000

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APPLIES TO


 * Microsoft Visual FoxPro 3.0 Standard Edition

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This article was previously published under Q136848



SYMPTOMS
When a Class library is browsed in the Class Browser and a class that has subclasses is removed, the error "Unable to Display Class Hierarchy" is displayed when the Class Browser form is refreshed.



CAUSE
A class contains an explicit reference to its parent in a .vcx file. If the parent class is removed, the derived class cannot find its parent, and the class hierarchy is incorrect.



RESOLUTION
Remove the child classes first, and then delete the parent class.



STATUS
This behavior is by design.



Steps to Reproduce Behavior

 * 1) Start the Class Browser (On the Tools menu, click Class Browser).
 * 2) Open a class that has some child classes. For example, open the Tsbase.vcx file located in the Vfp\Mainsamp\Libs directory.
 * 3) Click the Remove button to delete a class that has derived classes. For example, delete TSBASEFORM. The error "Unable to Display class hierarchy" is displayed.

Additional query words: VFoxWin

Keywords: KB136848

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