public ObjectPlacement InsertPlacement(int index, ScenarioModel scenario, string paletteKey)
{
var placement = new ObjectPlacement(scenario, paletteKey);
Definition.Placements.Insert(index, placement);
TreeItems.Insert(index, new TreeItemModel {
Header = placement.GetDisplayName(), IsChecked = true, Tag = null
});
Elements.Insert(index, null);
return(placement);
}
