Plotting and $-syntax ("dont show")



Dear Community!
First of all I would like to thank for the prompt and fruitfull feedback 
on my previous question concerned with plotting list-of-lines. I've 
decided to ask another ,,naive question" about the graphics facility :)

When I load .wxm file the calculations for commands ended with dollar 
($) sign do not show up. It seams to me that plotting might be treated 
as calculation (from the user, not only computer, perspective). 
Therefore I don't understand why, no matter how ends the plot2d command, 
whether with ";" or "$", there always performs the plotting action at 
the start of saved session.

It is slightly disturbing, especially when you have prepared a few plots 
and you want students to play with such prepared ,,worksheet" or even 
you want to slightly extend your worksheet. I know that one can for 
example plug the .wxm file into simple text editor, but  it is not 
convenient (and forbidden). Perhaps  I missed some point.

K.Lesniak