Resize listgrid columns like excel

Hello community and BB of course,

I'm looking for a way to resize the columns of a listgrid the excel way, i.e. when I resize the first column, the width of the last one should be adapted and not the width of the next col.
I've tried to modify the resize event but without success. There is the "b:columnmode" attribute in the listgrid source code. When set to something else than "fixed" the grid behaves like I want it, besides that the columns float away, but all other cols keep their size.

I appreciate every help so thanks in advance.

Kind regards
Thomas