/**
* Shows the window.
*/
public void show() {
BPELScript script = new BPELScript(this.engine.getWorkflow());
// Check if the workflow is valid before the user types in input
// values.
ArrayList<String> warnings = new ArrayList<String>();
if (!script.validate(warnings)) {
StringBuilder buf = new StringBuilder();
for (String warning : warnings) {
buf.append("- ");
buf.append(warning);
buf.append("\n");