_textEditor.addPropertyListener(this);
// create design page
_designViewer = new SimpleGraphicalEditor(this, getEditDomain());
// create SashEditor
_sashEditorPart = new SashEditorPart() {
protected void createPages() throws PartInitException {
addPage(_designViewer, getEditorInput());
addPage(_textEditor, getEditorInput());
}
};