Grid header extended over panel header

[sasklacz]

I'd like to get header of a single column extend over panel header wrapped around it :

todo.png

Nothing I've tried so far worked. Neither position absolute, z-indexes etc. The only thing that comes to my mind is creating a dummy element and moving it in the correct position.

[mitchellsimoens]

You only want one column header to extend?

[sasklacz]

I want to highlight the whole column (and to be able to do the same with all the columns), but if I'll have the header extended I think I'll manage to do the rest (as cells in column inherit id from header).

[sasklacz]

would it change anything if I'd want only one column extended ?