superClassField.setLabelText("&Superclass:");
superClassField.setButtonLabel("Brows&e...");
superClassField.doFillIntoGrid(container, nColumns);
PHPContentProposalAdapter contentProposalAdapter = new PHPContentProposalAdapter(
superClassField.getTextControl(), new TextContentAdapter(), new PHPContentProposalProvider(
getScriptFolder().getScriptProject()), null, null);
contentProposalAdapter.addContentProposalListener(new IContentProposalListener() {
@Override
public void proposalAccepted(IContentProposal proposal) {