You can open old class in the Class Designer and than use 'Save As' to save it into the genclass.vcx overwritting corupted class.

>I want to copy one single class control from the genclass.vcx library
>
>we have more than 20 diff class controls in the genclass.vcx
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>because i am looking for gendate class control which is in it.
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>in the current copy of the project the gendate control is not working properly so i want to replace the gendate control from the old backup copy.
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>Sergey could you please tell me can i replace the (gendate)control from the backup copy from genclass.vcx
>
>Thank you.