public void createEnvelope() {
String propName = (String) propertyCmb.getSelectedItem();
Parameter parameter = currAction.getParameterByName(propName);
Double val = Double.parseDouble(parameter.getValue());
Envelope env = new Envelope(val);
env.select(0);
parameter.setEnvelope(env);
setCurrEnvelope(env);
enableControls();
refreshEnvelope();
}