Hide/ Un-Hide CBA Button

[somnathbanik]

Hi,
I am trying to hide and un-hide the cba button during run time.
The code below helps me to hide the cba button

  CEikButtonGroupContainer*  cba = CEikButtonGroupContainer::Current();
     cba->MakeVisible( EFalse );

But if I use

  CEikButtonGroupContainer*  cba = CEikButtonGroupContainer::Current();
    cba->MakeVisible( ETrue );

I am not able to unhide the cba button


Please suggest me.