Adding eclipse UI form to a AbstractDecoratedTextEditor

Question

I am trying to add a form in the lower half of text area in AbstractDecoratedTextEditor but the form shows up in the right half of the editor by default. Is there a way to have the form displayed in the lower half of the editor without writing a text editor from scratch and adding the text area and form in a grid layout ? This is the class I have so far.

public class Editor extends AbstractDecoratedTextEditor
{
  public Editor()
  {
    super();
    setDocumentProvider(new DocumentProvider());
  }

  @Override
  public void init(final IEditorSite site, final IEditorInput input) throws PartInitException
  {
    super.init(site, input);
    if (input instanceof EditorInput)
    {
       text = ((EditorInput) input).getText();
    }
  }

  @Override
  public void createPartControl(final Composite parent)
  {
    super.createPartControl(parent);

    final FormToolkit toolkit = new FormToolkit(parent.getDisplay());
    final Form form = toolkit.createForm(parent);
    form.setText("Testing.... 1 2 3.....");
  }
}