Problem with PPL in MSVC 2010 using MFC

I have encountered with a problem with Parallel Pattern Library when using it along with MFC. I have a method class, wich responds to a button click:

Code:

void Ctest_taskDlg::OnBnClickedButton1()
{
    
    using namespace Concurrency;
    tasks.run([&]{add_to_in();});
    tasks.run([&]{add_to_out();});
    tasks.wait();
    ::AfxMessageBox(_T("Done"));
} 

add_to_in() and add_to_out() is a member fucntions of Ctest_taskDlg class, each of them prints a 10 000 symbols to a RichEdit control. A task_group tasks is a member of Ctest_taskDlg class too.

When I press the button, it executes only add_to_out() function, and then main window of an application is freezes.

What would cause this? Thanks in advance!