'Cannot focus a disabled or invisible window' on Win98, not XP.

Hi,

I use Delphi 7 Studio Enterprise on two machines (no network, just for comparison). The application I have runs on the XP machine flawlessly, but on the Windows 98 machine I keep getting "Project raised exception class EInvalidOperation with message 'Cannot focus a disabled or invisible window'. Process stopped. Use Step or Run to continue.

When I close the errormessage, the code that raised the exception turns out to be:

procedure TPropertyFrm.ShowContents(XObject : TObject);
begin
   IL_Property.Assign(MyProgramMain.IL_Nav);
   m_Closing := FALSE;

   if ED_Caption.Visible and ED_Caption.Enabled then
   try
      ActiveControl := ED_Caption;   //   <------- here is the hangup
   except
   end;
     
   DoDataExchange(FALSE);
end;

I compared the installation settings on both standalone machines and made the as similar as possible. Yet the problem stays.

What do you make of this?

Thanks,
Ron dW