MFC dialog freezes when it looses focus

I am new to MFC so please bear with me. I have a Dialog that is displayed in full screen on a dual screen monitor. This dialog is instantiated inside another non-modal dialog (when a button is clicked). Something like:

void MyCParentDlg::OnBnClickedButton1()
{
        dlg2 = new MyChildNonModalDlg();
        dlg2->ShowWindow(SW_SHOW);
}

In the OnInitDialog() of MyChildNonModalDlg , ShowWindow(SW_MAXIMIZE) is invoked to make it the dialog full-screen with no-border. Now, there is a button callback event inside MyChildNonModalDlg :

void MyChildNonModalDlg::onBnClickedBut2() {
    // Display images on the dialog one by one for a very long time 
}

While onBnClickedBut2 is running and the dialog is being updated continuously, if I click with my mouse outside the dialog (say on the other screen) meaning when the dialog looses focus , it freezes!

I know this is something perhaps that can be fixed with multi-threading, where the process inside OnBnClickedBut2() must run inside a thread, but as someone who knows very little about thread, can someone point me to the right direction or provide code examples that can do this?

---

Use AfxBeginThread to create new thread inside onBnClickedBut2 . You are not supposed to block UI event handlers. Hope you got it by now.

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