Is there any way to disable needles on a slider?

I was wondering if there were any way to disable needles on a slider. What I have is a slider with four needles, but I need to be able to disable two of the needles programmatically. I am currently setting the needles to transparent color and setting their values to +/- inf, but the user can still accidently select and move them. While this does not cause the program to work incorrectly, it does cause some visual confusion, since I am using fill modes. Basically, I am using the slider to allow the user to select areas on a graph, the filled area between the sliders are the areas that are being measured on the graph. The extra two sliders are for when the user wants to select multiple areas for measurement, and thus are
not always in use.
Jon D
Certified LabVIEW Developer.

Just ran into this issue with an application.  Solution attached. 
Use the Value Changed Event and set the current value of the slider to the previous value.  Some display artifacts occur as the UI thread is executed, but the subVI prevents the user from changing the value of a slider.
-Adam
Attachments:
SliderNeedleLock.vi ‏17 KB
TEST_SliderNeedleLock.vi ‏16 KB

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