how to calculate number of tabs of CTabCtrl

I am  modifying  application  developed  in VC++,MFC 6.0
There  are  seven  tabs  in  tab control.I  have  been asked  to  develop  a  functionality  such  that  when user  clicks  fifth  tab ,sixth  and  seventh  tab  should be  visible  and  when user  clicks  any  of  first  four  tabs,sixth  and  seventh  tab  should  be  invisible.
What  I  am  doing  now  is  on  fifth  tab  On_Show_Window  i am  inserting  two  tabs  and  when  user  presses  any of  first  four  tab  I  am  deleting  last  two  tabs.Problem  is  now
if  user  presses  any of  tab  repeatedly error  comes  because  i  dont  have  run  time  count  of  number  of  tabs,There  is  one  public  variable  m_nNumberOfTab,something  like  that  of inherited  class(Inherited  from CTabCtrl) but  that variable  always  writtens  value  7  irrespective  of actual  count.Please  help  how  to get actual count
ADITYA RAOSoftware DeveloperAsked:
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jkrConnect With a Mentor Commented:
'CTabCtrl::GetItemCount()' (http://msdn.microsoft.com/en-us/library/ca3h5k6c%28v=vs.90%29.aspx) should give you the information that you need:

Retrieves the number of tabs in the tab control.
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