Filelistbox and rigth mouse button question

Hi to all, and thanks for any replays.

When I click with the mouse (left button) on a file, this file does get
executed, even another file was highligthed.

When I click with the rigth mouse button, the highlighted file get's
executed and not the file I click on.
I rather have the rigth mouse button act as the left one does.

Question:
Why is that and is there a way around it?

Thanks for any replays

Gery

www.zipworld.com.au/~gprdata

Have a great day