Formatting Column Headers and Title

[MSBZ]

1) I am trying to format the Column Titles differently in the following example:  

I need the different segments (Global Enterprise and Enterprise shown here) to be individual unique colors. I know you can change Value headers but it is the Column Headers that I need to change. 

2) Also, how do I hide the Column Header Title (in the example hide Segment)? 

[lbendlin]

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To hide the Segment string render it with the same font and background color.