Text txtValue = factory.createTextArea(subform, "Description", "description");
GridData txtValueLayoutData = new GridData(GridData.FILL_BOTH);
txtValueLayoutData.minimumHeight = 200;
txtValue.setLayoutData(txtValueLayoutData);
WGDescriptionMetaFieldDefinitionModel descriptionMetaFieldDefinitionModel = new WGDescriptionMetaFieldDefinitionModel(_model);
descriptionMetaFieldDefinitionModel.addListener(new BeanChangedListener<WGMetaFieldDefinition>() {
public void changed(WGMetaFieldDefinition bean) {
_treeViewer.refresh(bean, true);
_model.fireModelChanged();
}
});