Hello Yao,
I think that the easiest way to achieve such king of header`s layout is to use our UltraGird`s layout designer. By this way without any line of code, you are able to get this layout. Please take a look at the attached sample for more details.
If you want to achieve this layout using the code, please take a look at the second sample UltraGridGroupsLayout for more details.
Please let me know if you have any questions.
Regards
Sample 1:
Sample 2:
Screenshot :
Have you been able to resolve your issue ? Did you have a time to take a look at the attached samples. Please let me know if you have any questions.