private void InitGUI() { if (_searchAvailable == null) { _searchAvailable = new SearchField(); } if (_availableItems == null) { _availableItems = new CollectionTreeView(); _availableItems.ItemDoubleClicked += OnAvailableDoubleClick; } if (_searchCollection == null) { _searchCollection = new SearchField(); } if (_collectionItems == null) { _collectionItems = new CollectionTreeView(); _collectionItems.ItemDoubleClicked += OnCollectionDoubleClick; } }