@jim said: I've moved this to the Tutorials section: http://www.sketchucation.com/forums/scf/viewtopic.php?f=26&t=6067 It works! Thank you very much for your assistance. I agree that your decision of WebDialog positioning problem must be in the Tutorial section - it’s very useful.

you can change the color of the lines from black to grey but they will still not be transparent.

@alan fraser said: In other words, your red example logically ought to show the same difference as the green...but it doesn't...because it's red. OK! Thank you for your opinion and for the really pretty phrase I have quoted ! In my task I have to work with lines (edges) on the faces backgrounds. Therefore the relation between the edge screen colors (stable) and the faces screen colors (changeable) is very important to me. So I really see a problem . Thank you again for your answer. I will take into consideration the SketchUp color visualization properties you have mentioned. Good luck!

It's work! You did it! Thank you very much! I appreciate your assistance - it was a good lesson to me. I was so stupid ...