Transparent Fill Slide controls?

I use a Numeric Fill Slide in my program to indicate the value of a particular quantity that I can set in a variety of different ways.  It occured to me that it would be pretty nifty if I could actually set the value by clicking on this indicator as well.
Then it occurred to me that, rather than change the Fill Slide to a control and setting its value using a local variable when necessary, I could just make a separate Fill Slide control, make it transparent, and put it on top of the Fill Slide indicator.
Unfortunately, this doesn't work: I can use the Paintbrush tool to change the color of the empty Fill Slide to whatever I want, but if I set it to transparent, any objects underneath the Fill Slide will still not show through.
Is this behavior by design?  Or is it a bug in LabVIEW 8.5?  Or is there some other way to make the Fill Slide transparent that I am not aware of?

The background is just a decoration. To color it transparent, you need to click the right edge of the slide, just outside the resize area. Another option is to customize the control and make it very small.
Try to take over the world!

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