is there any way to design DataGridView with Expand/Collapsible Header Column ?
output look like
+ 2010 +2011
------------------ ----------------------
Days JAN FEB MAR JAN FEB MAR
-------- ------------------- ---------------------
1 11 22 20 87 45 66
2 11 22 20 87 45 66
3 11 22 20 87 45 66
4 11 22 20 87 45 66
5 11 22 20 87 45 66
31 11 22 20 87 45 66
when click on (+/-) button then that column will expand & collapse and as well as child columns will be expand & collapse along with parent column.
without using any third part control how can i customize grid for my requirement. please guide me. thanks