if (selectedDataset != null) selectedDataset.getNode().setSelected(false);
	public void setSelectedDataset(BrowserDatasetSummary dataset) {		// if they're the same, return		// except for if it's null. then we might need to redraw		if (dataset == selectedDataset && dataset != null)			return;		selectedDataset  = dataset;				// if a dataset is clicked on to be selected, it has already		// told the canvas to draw to it.		if (selectedDataset == null) {			// selected is not null display it			Collection datasetsToDisplay = allDatasets;			displayDatasets(datasetsToDisplay);		}		mainWindow.setSelectedDataset(dataset);	}