Method windowOpened

src/org/opensourcephysics/tools/DataTool.java:299–306

(WindowEvent e)

		} else {
			tool.addWindowListener(new WindowAdapter() {
				@Override
				public void windowOpened(WindowEvent e) {
					if (tool.getTabCount() == 0) {
						DataToolTab tab = tool.createTab(null);
						tab.setUserEditable(true);
						tool.addTab(tab);
					}
				}
			});
			tool.setVisible(true);
		}