title: How to hide multiple tabs in TTabcontrol
body: <p>My program has three drop-down and one ttabcontrol which has 5 Tabs. what i need to know is how can i hide all the tabs and set their visiblety back again if drop-down menu has a particular item selected.
  For example
  My drop-down has index item of.
  A , B ,  C , A+B , A+C
  TabControl had following tabs.
  A B C 
  Now i need to hide all the tabs and unhide tab A if drop down has selected a or a &amp; b if dropdown is Selected to A+ B.</p>