public DSModelElementsByCategorySelection()
     : base(
         SelectionType.Many,
         SelectionObjectType.None,
         message,
         prefix)
 {
     DropDownNodeModel = new DSRevitNodesUI.Categories();
     SelectedIndex     = DropDownNodeModel.SelectedIndex;
     SelectionFilter   = new CategoryElementSelectionFilter <Element>();
     base.Filter       = SelectionFilter;
 }
 public DSModelElementsByCategorySelection(IEnumerable <string> selectionIdentifier, IEnumerable <PortModel> inPorts,
                                           IEnumerable <PortModel> outPorts)
     : base(
         SelectionType.Many,
         SelectionObjectType.None,
         message,
         prefix,
         selectionIdentifier,
         inPorts,
         outPorts)
 {
     DropDownNodeModel = new DSRevitNodesUI.Categories();
     SelectionFilter   = new CategoryElementSelectionFilter <Element>();
     base.Filter       = SelectionFilter;
 }