HowTo add buttons or links to the toolbar
Despite the links you can add to the text columns you can also have button and links in a horizontal toolbar at the bottom of the detail window. In order to avoid a mixture of controls it is only possible to use links or buttons. Thus you need to set the element type centrally, e.g.:
After that you can add the actual elements:
The detail window has only very limited layouting. Thus all elements need to fit on the window, otherwise the elements might be clipped.