[PyMOL] questions about electrostatics

[Qun Wan]

Hi,
I want to show the electrostatics of my protein. However, when I 
click electrostatics from the Demo menu, the molecule shown in 
electrostatics is not what I want. Does any one know what is wrong?
Meanwhile, I want to show my protein according to its B-factor. When 
I label it in color from the tool bar that says "by b-factor", the 
whole molecule is shown in blue, not colorful as I want: for example, 
the red means high b-factor, the blue means low b-factor, other 
colors are in the middel range. Anyones knows how to improve the 
color labelling?

Thanks!