Hi shinu,
I solved the issue to set the header text to bold.In our code somewhere after apply font-weight to bold for each cell,we are setting the header text as
"<b>Test</b>"
; because of the bold tag while rendering it was not taking the style that i applied as you suggested above.
so i replaced bold tag with span as below:
"<span style='font-family:Verdana;font-weight:bold'>Test</span>"; and removed the cell style and it worked well.
Thanks for the support.
Radha