Method implementation + small bug

Hello there.
I found a little issue in Umbrello (I'm using 2.14.2 under Debian 
Jessie): when adding a method to a class and generating code, the code 
for the class is generated inside the header file in C++ instead of in 
the source file.
In addition, even if the method is declared as private, it is added in 
the code as public.

Next, is there any way to implement a method using a diagram?