FLEXGRID - Dynamic Control Grid


I am currently using the FLEXGRID Control. On the left hand side in the Control menu it is called Dynamic Control Grid.

My problem is that I cannot manage to make the SelectableLine Elements read-only. Even in the examples provided by Application Designer Demo Area, the Flexgrid entries are editable. (Sample 40_Flexgrid2)

Meaning by that, the user should not be able to click inside a single cell and for example delete the cell entry with his keyboard Backspace.

Any ideas how this is possible?