>Hi all
>
>I have this set of classes for textbox, checkbox, combo, etc. Each of them require a minimum set of codes. right now if I make any changes to one I have to remember and change all of same code in other classes.
>
>Any suggestions.

Bhavbhuti,
How about you create a custom class (need not be in a vcx) and add common metods to it ?

ie:

*Assumed saved as CommonProcs.Prg
define class myCommonProc as Custom
 procedure CheckValidation
 lparameters toObj
 lcControlsource = toObj.Controlsource
*...
endproc
enddefine

* Base form class load
this.oCommon = NewObject('myCommonProc','CommonProcs.prg')

* A control's valid
thisform.oCommon.CheckValidation(this)

Cetin