Add elements to an existing selection set#
To modify SOFiPLUS(-X) elements with a dialog, the elements have to be selected first. After the selection set has been completed and the dialog is opened, there is no chance to add elements to the selection set. If elements are to be added, the selected elements are immediately deselected when you click in the AutoCAD window.
To avoid this behavior, check the small checkbox in the footer of the dialog named Add Elements.
Now it is possible to add elements in the drawing to the active selection set.