Dialogs for editing XPDL element properties

The most of the dialogs for editing XPDL elements have a toolbar with a buttons for navigation between property panels, as well as for applying/reverting the changes in the currently displayed property panel.

The toolbar buttons are:

Shows previous panel.

Shows next panel.

Discards changes made after last apply action (reverts to previous state).

Applies the changes made in the panel.

Applies the changes made in the panel and closes the dialog.

Shows parent element panel.