* @param sourceClass The class for which the service should be created.
*/
private void addWMTSourceToTree( TreeItem treeItem, Class< ? extends WMTSource> sourceClass, WMTWizardControl controlFactory ) {
TreeItem newTreeItem = new TreeItem(treeItem, SWT.NONE);
WMTService service = serviceExtension.createService(sourceClass);
newTreeItem.setText(service.getName());
WMTWizardTreeItemData data = new WMTWizardTreeItemData(service, controlFactory);
newTreeItem.setData(data);
// newTreeItem.setData(service);
}