[vtkusers] font color of color bar

[Zhengyu Zhang]

Hi,

I am using a color bar to annotate values, but I found the font is by 
default white. Since I am using white background (have to be white), the 
fonts are rather vague. I checked the manual of 'vtkScalarBarActor' but 
seems to be unable to set the color? There is an 'setLabelFormat' funtion 
but I don't know what parameter should I give. Anybody can help me? Thanks 
a lot!

Zhengyu