I am having problems with my \"Toggle Completion Mode\" under the Edit->Intellisense tab in Visual Studio 2010 Professional. The picture describes it quite well.
There is no possibility to turn on suggestion mode on C++ IntelliSense (both in VS 2010 and 2012).
MSDN Library (for VS 2010) says:
Suggestion mode is available in Visual Basic and C#.
It was reported (link) as a bug in VS 2012 RTM and the answer from Microsoft was:
C++ Intellisense only has one completion mode, while VB and C# Intellisense has two different completion modes. Therefore, this command to toggle between completion modes is not available for C++ Intellisense.
If you're annoyed by inserting unwanted code after pushing space when you forget to press ESC you can make the member's list show up only after pressing ctrl+space (or alt+right arrow). In order to do that go to Tools -> Options -> Text Editor -> C/C++ -> General
and uncheck Auto list members
.