I found the following question at Experts Exchange, which I hope someone has
a working solution to..

the bottom of the dialog. In the added combo box are a list of previously
used directories for saving reading.
What I want to do is when somebody selects a directory on the ComboBox this
will change the default directory in the CFileDialog to the one selected in
the ComboBox.

Accepted Solution:

I send another suggestion after that. But I can not see it. I do not know
what's wrong. I want to tell you that add this line in your program:
GetParent()->PostMessage( WM_NOTIFY,  CDN_FOLDERCHANGE, 0);
Please try to see if it works. If the message can be receive by the window,
may be you do not need to fill the structure after you use
SetCurrentDirectory.

The problem is that the solution does not work. It Just Crashes! I don't
believe you can Post a WM_NOTIFY message in that manner.

I tried the following in my CFileDialogEx::OnComboBoxSelect() and it had no
effect.
CFileDialogEx::OnComboBoxSelect()
{
// ...Some code left out

// m_notify is defined as NMHDR notify and is a class member.
 m_notify.hwndFrom = m_hWnd;
 m_notify.idFrom = 0; // I tried the actual Ctrl ID here but it did not make
a difference
 m_notify.code = CDN_FOLDERCHANGE;
 GetParent()->PostMessage( WM_NOTIFY,0,(LPARAM)&m_notify);

// ...Some code left out

Any Help is appreciated,
Thanks in Advance,
John M. Drescher

http://www.*-*-*.com/

Answering my own question,

I found the following to work, by adding a hook to the window and tracing
the messages sent to the window after pressing the enter key:

CFileDialogEx::OnComboBoxSelect()
{
// ...Some code left out

CWnd* pWnd = GetParent()->GetDlgItem(edt1);
GetParent()->PostMessage(WM_COMMAND,1,(LPARAM)pWnd->m_hWnd);

// ...Some code left out

Sending this message to the edit control for the file name, windows refreshes the dialog as if the user pressed the enter key.

John M. Drescher

http://www.geocities.com/SiliconValley/Haven/1654/