Tooltips don't work for CEdit controls

Hi, I'm using VC++ in VStudio 2005. Inside my dialog of CDialog base type,
I'm dynamically (programmatically) creating several child edit controls of my
own type (CSendchk) based on CEdit. These edit controls look and function
perfectly within the parent dialog.

I would like to display a tooltip when mouse hovers over any of those edit
controls. So, as the help reference guide suggests, I added a call to
EnableToolTips(TRUE) inside my InitDialog() method and hook the notification
with my override CSendchk:OnToolTipNotify().

As expected, I do receive the notification for my OK and Cancel buttons, so
the tooltip notification system apparently works. However, I receive none
for any of my edit controls.

Anyone know why?

My edit control creation code is:

for ( int iCnt=0; i<10; iCnt++ )
{
   (control positioning code here)

   m_pedtCells[iCnt] = new CEditchk();

   m_pedtCells[iCnt]->Create(WS_CHILD|WS_TABSTOP|WS_VISIBLE,
   r, this, iCnt+1 );
}

Thanks for any help

maple