title: How to highlight the same C++ variable on Visual Studio 2010
body: <p>I am using C++ coding editor on Visual Studio 2010.
  I remember the IDE will help highlight the same variables when I selected a variable.But it doesn't work now.</p>
  
  <p>I have enabled the "Auto list members" and "Parameter information" on the C/C++ option.</p>
  
  <p>And it doesn't help showing the members of the namespace when I type the "." or "->".</p>
  
  <p>Someone please help.</p>