}
public void run() {
JPanel jpanel = (JPanel) adapter.getWidget();
if (jpanel.getLayout() != null) {
IUndoableOperation operation = new NullLayoutOperation(adapter);
operation.addContext(adapter.getUndoContext());
IOperationHistory operationHistory = PlatformUI.getWorkbench()
.getOperationSupport().getOperationHistory();
try {
operationHistory.execute(operation, null, null);
} catch (ExecutionException e) {