[CMake] CPack/NSIS - Order of components

[Johannes Stallkamp]

Hi,

how can I control the order in which components show up in the NSIS 
installer using CPack?

Obviously, NSIS shows them as listed in projects.nsi generated by CPack. 
But I don't understand how to tell CPack my preferred order,
e.g. base system first, optional packages second..... currently it 
always comes out the other way round. Or does CPack always automatically 
put component groups first and ungrouped items second?

My project:
- base system A
- some other major component B
- group 1 X:
    - option 1a
    - option 1b
- group 2 Y:
    - option 2a
    - option 2b

Outcome:
- group 1 X:
    - option 1a
    - option 1b
- group 2 Y:
    - option 2a
    - option 2b
- base system A
- some other major component B

So both the groups and the single items are sorted alphabetically 
independently.

What can I do to order the components in some specific way ( preferred: 
order of definition ) ?

Regards,
Johannes