Question about creating chart using CreateWnd

[User (Legacy)]

Good morning! 

I am trying to create a chart fx floating window.  I use the example in the 

help files- it works perfectly on my machine. 

But some of my users are getting an error when 

  m_pChartFX->CreateWnd((long)this->m_hWnd, IDC_CHART1, rc.left, rc.top, 

(rc.right- rc.left), (rc.bottom - rc.top), 

   WS_CHILD | WS_VISIBLE); 

is called.  The floating window is derived from a CWnd object and calls the 

chart fx CreateWnd call in its OnCreate call.  On my machine, this works 

perfectly.  On the User's machine the CreateWnd call errors out and throws a 

fatal exception. 

But if the user opens a chart fx object on a dialog box before trying to 

open the floating window, and then tries to open window, it works perfectly 

from then on. 

Any help would be appreciated...  Thank you. 

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Josh Eanes