I agree with Altenbach on this suggestion.
If they are not static, I can only offer a clue.
In this link you will find a VI that will apply a mask to an image to allow for transparency.
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=506500000008000000B0FF0000&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0
Elsewhere on this exchange there is an example that shows you how to rotate an image in a picture control.
The idea would be to use a picture control, insert some rotated text to provide the sloping text.
The complicated part is that the "off-the-shelf" functions for inserting images into pictures work with recangular regions.
The sloping text will require replacing a parallelogram from one image into another.
Betwe
en the;
1) Picture control
2) Insert text
3) Rotate bitmap
4) apply a mask
there appears to be the elemnets that are required to crack the nut you are after.
I appreciate you sharing your results of the "scroll-wheel". I hope you will do the same if you figure out this challenge.
Please keep us posted.
Ben