Is there a way to color the grouping headers based on certain values? In my case I want to color them based on how many items are in each group.
I'm sorry if this is answered.

I have not tested this, but can this work out for you?
There might be some errors in code, but it gives you the idea
groupHeader: function (value, count, data) {
//value - the value all members of this group share
//count - the number of rows in this group
//data - an array of all the row data objects in this group
var str = "";
var the_header = "";
if (count < 10)
{
the_header = "<span style='color:#d00>" + value + "</span>"
}
else
{
the_header = "<span style='color:#fff>" + value + "</span>"
}
return the_header;
},
That is it. I didn't realize that the code goes in the constructor for the table. Thank You