I have tried:

 CString CaptionText = _T("Dynamic Heading");
 dlgDialogBox.SetWindowText(CaptionText);

and I keep getting an assertion failure.  The SetWindowText function is
supposed to take a CString object, so I'm confused.  (My normal state of
existence!)

Any suggestions would be appreciated.  Thanks.

Stephen

CWnd::SetWindowText
void SetWindowText( LPCTSTR lpszString );

Parameters

lpszString

Points to a CString object or null-terminated string to be used as the new
title or control text.

Remarks

Sets the window?s title to the specified text. If the window is a control,
the text within the control is set.

This function causes aWM_SETTEXT message to be sent to this window.

CWnd Overview |  Class Members |  Hierarchy Chart

See Also   CWnd::GetWindowText,::SetWindowText

Soorej

In that case, your problem is that you are changing the text of a control
that doesn't exist yet, which is clearly impossible and causes the crash.
To resolve this, I recommend adding a CString to your dialog declaration.
Then in the InitDialog function, add a call to set the window text to the
CString.
Final, simply set the cstring before domodal

//In the function that create the dialog
dlgDialogBox.CaptionTest="Dynamic"
dlgDialogBox.DoModal();

//In the dialog definition (.h file, inside the class bit)
public:
CString CaptionTest

//In the InitDialog handler
SetWindowText(CaptionText);

Hope that helps,
Robin