private void AddPresenterIfNecessary(DocumentCompositeNode visualTreeNode, SceneElement newElement) { Type targetType = (Type)null; if (PlatformTypes.ContentControl.IsAssignableFrom((ITypeId)newElement.Type)) { targetType = newElement.ViewModel.ProjectContext.ResolveType(PlatformTypes.ContentPresenter).RuntimeType; } else if (PlatformTypes.ItemsControl.IsAssignableFrom((ITypeId)newElement.Type)) { targetType = newElement.ViewModel.ProjectContext.ResolveType(PlatformTypes.ItemsPresenter).RuntimeType; } if (!(targetType != (Type)null)) { return; } DocumentNode node = visualTreeNode.SelectFirstDescendantNode(targetType); if (node == null) { PanelElement panelElement = (PanelElement)this.SceneViewModel.GetSceneNode((DocumentNode)visualTreeNode); SceneElement presenterElement = (SceneElement)this.SceneViewModel.CreateSceneNode(targetType); SceneElement sceneElement = this.PreparePresenter(visualTreeNode, presenterElement); GridElement gridElement = panelElement as GridElement; if (gridElement != null) { int count1 = gridElement.ColumnDefinitions.Count; int count2 = gridElement.RowDefinitions.Count; if (count1 > 0) { sceneElement.SetLocalValue(GridElement.ColumnSpanProperty, (object)count1); } if (count2 > 0) { sceneElement.SetLocalValue(GridElement.RowSpanProperty, (object)count2); } } panelElement.Children.Add((SceneNode)sceneElement); } else { SceneElement presenterElement = this.SceneViewModel.GetSceneNode(node) as SceneElement; if (presenterElement == null) { return; } this.PreparePresenter(visualTreeNode, presenterElement); } }