I would like to change the default background (grey) of an xy chart to another colour or even transparent. I have searched through all the customisation options but cannot find anything relating to the chart background.
Im not sure exactly which color are you want to change. Heres a VI, you can programatically change the color of the plot area. Thats the "BG Color Box" in the vi and change the FG color which just gives some small accents. Also if you want to change the frame color I havent found any way to change it programatically but I made it transparent as you suggested. Use the paintbrush on the tools pallet and select the color you want in the top of the two list boxes then click on the frame with the brush tip. Hopefully this simple solution solves your problem. If not let us know and we can come up with other options for you.
There is no direct method to change the frame color programmatically. Only a work-around, described here : http://forums.ni.com/ni/board/message?board.id=170&message.id=91016#M91016 I'll try to post a corresponding vi later...