@Override
	protected void setPreviewPaneAttributes() {
		if (previewList == null) {
			previewList = new JList<>();
		}
		previewList.setOpaque(true);
		previewList.setBackground(PREVIEW_WINDOW_BGCOLOR);
		previewList.setForeground(PREVIEW_WINDOW_FGCOLOR);
		previewList.setFocusable(false);
		previewList.setModel(new DefaultListModel<String>());
	}
Returns a list of all selected items in the list.

@return the selected items
Ghidra/Framework/Docking/src/main/java/docking/widgets/DropDownMultiSelectionTextField.java