"Ctrl+." Problem of SlickEdit 12.0.2

SlickEdit is one of the best programmer's editors, current version is v12.0.2.

There is an annoying bug of v12.0.2 while programming in C++ language

• Some times, press "Ctrl+." (Go to Definition Of ...) on a symbol, only the corresponding header files are shown, but not the C++ source file with the function definition; this was casused by "using namespace ...;" in *.cpp/*.c source files
  

Solution:

• define a using macro, set that macro in Tools > Options > Tagging Options > C Preprocessing