Internet Explorer Dev Tool - unable to open

Internet explorer has awesome tool for debugging  client side scripting as well as many things -

Page styling / font - color changes etc.

Recently I faced problem with IE 8 - I was unable to open  Dev. Tool  by pressing F12

or Clicking  from IE settings menu ..

There could me multiple solution either dev. tools might be minimized in unable to see or Hidden

The solution for me was - updating flag in Registry - Default Developer Tool was disabled.

Here is path is Registry

HKEY_LOCAL_MACHINE  => SOFTWARE => POLICIES =>MICROSOFT =>

INERNET EXPLORER => IEDevTools

Set value for Type REG_DWORD to 0

Your Dev. Tool will be Back ...!

Happy Debugging ..