Forms Data Controls :: Get Gridview Column Headers When Creating Dynamic Columns?

i have a gridview which is populated from a stores proc using pivot tables. The column are created dynamically apart from a total column which is created as a template field. the gridview looks like below:

CPW
EE
Foh
H3G
IND
O2
ORG
P4U
T-M
TSC
VIR
VOD
Total

Stores Visited

70
0
0
12
0
16
18
7
11
1
2
8
145

i need to add a hyperlink to each gridview cell and when that cell is clicked pass the header text through the querystring to another page. I can access the cells value ok and pass that through but i cannot seem to access the cells column header text. when i response.write out a count of the gridview.columns it brings back 2 which is the template fields but not the dynamic fields i have tried this on the rowdatbound, rowcreated, page_load and page_unload. the count should be 12 its like it cannot find the dynamic columns at all. ?

here is my code for populating the gridview

[Code]....

and here is my gridview:

[Code]....

i am also moving the total column in this code

[Code]....

and calculating my total in this code and adding my link to the total colum (which works fine)

[Code]....

now i just need to somehow add a link to the other cells and somehow get the value of the header text for that cell clicked.