I assume you mean the auto-complete feature? I see two possible causes:
1) the header file defining those values etc. is not included
2) the auto-complete window can be configured to show either macros, non-macros or both - maybe it's set to only one of them => press 'ctrl + space' while the auto-complete listbox is opened.
A third possibility: sometimes the AC list doesn't show the macros etc, even if they're included and 'show all' is selected, caused by a preprocessor or syntax error anywhere in the affected file (in my case it was an error in a header file). It seems the code window then stops parsing the other files and therefore the list is incomplete.