The color is there, but somewhat hidden, since it is not a color as much as a command to match the background color. To get it, drop a dialog label from the dialog control palette onto a blank part of your VI and type a bit of text into it to make it stay around. Use the color copying tool to grab the color of the label, then the coloring tool to color whatever text you wish. No matter where you move it, the text background will be opaque and match the background color. If you are using a free label, just use the dialog label in the first place.
NOTE: This is an undocumented feature and not supported by NI, so use at your own risk.
