nattable - problem with column headers selection in the nat table with columngroupheader

Question

I posted a following question several days ago where I solved problem with row selection. enter link description here

Row selection works correctly. Now I work on another improvement. After row selecting all columns headers in the column group header should be selected. This improvement will be used for copying. Problem is when I select a cell and row selection is made not all column headers are selected (see illustrated example). enter image description here

Where can be the problem, please ? I use the code which is posted in a question link above. I expect problem can be in column header implementation.

question from:https://stackoverflow.com/questions/65934108/problem-with-column-headers-selection-in-the-nat-table-with-columngroupheader

Answer 1

Waitting for answers