Hi Gal Verlič
Right click on this field in the data grid (purple) then add an action button. There you can set on click behavior to delete or edit.
Right-click in the searchbar of the datagrid:
The New-button is ‘Create’. For the delete-button is more work: select ‘Action’, then rightclick the Action-button and select ‘Edit on click Action’ followed by ‘Delete’
Add another data grid on top of that (temporary). Copy the buttons and paste them in the orignal data grid and delete the temporary data grid. :)