I just found a much simpler solution to this problem. Using a regular label with the text rotated 90 degrees, simply preface the text with <html><nobr>, and it will override the ellipsis behavior and prevent the text from wrapping.
Result:


I just found a much simpler solution to this problem. Using a regular label with the text rotated 90 degrees, simply preface the text with <html><nobr>, and it will override the ellipsis behavior and prevent the text from wrapping.
Result:

