I found it! You were right Mike, the properties were re-set in code.

 Thank you guys, dahrlin 🙂

 Right Mike, something is wrong. I need to check whether this property is re-set somewhere.

Sorry for my ignorance, but what do you mean with "loading a layout"?

 /dahrlin 🙂

Thank you all for your assistance!

 Well… right now I am at home and don't have the source code available. But I am sure I've set the properties according to what was described above. 

Any other properties which could disturb the desired behavior?

 Have a nice day!

Hi!

I mean that the entire column is selected/highlighted. The column header isn't highlighted at all, just the column underneath. 

 /dahrlin 🙂

Hmmm… I tried the above proposal to disable column sorting.

 The sorting is indeed disabled, but when clicking a column header, the entire column is marked. I'd like to disable the sorting and avoid marked columns. Is there away to achieve this.

 Kind regards, darhlin