private EC2InstancesManagementWindow window;
@Override
public void actionPerformed(ActionEvent e) {
if (this.window == null) {
this.window = new EC2InstancesManagementWindow(AmazonEC2MenuItem.this.engine);
}
try {
this.window.show();
} catch (Exception e1) {
AmazonEC2MenuItem.this.engine.getGUI().getErrorWindow().error(e1);