! API: The protected methods in CPanelPopup have an additional
parameter, that tells them for which Dockable the popup-dialog is shown.
 - Bugfix: A CPanelPopup will now wait with opening its popup-dialog
until the focus has been transfered to the Dockable for which the dialog
is shown. Otherwise the dialog would receive the focus, and then the
focus would be stolen by the Dockable, and that event would close the
popup.