Adding controls – PB Docs 2019

All windows serving as the basis for a form style have at least
one DataWindow control. In addition, you can add any other controls that
you can add to standard PowerBuilder windows, such as command buttons,
user objects, text, edit boxes, pictures, and drawing objects.

Users of the form can move the controls you place in the window,
but they cannot delete them.

Users can also add controls to the form in the Form painter. They
make CommandButtons and PictureButtons work by associating actions with
them. Actions are described next.