How to get grapicdriver in View?

HI!

I like to use graphic driver function in my mfc application, it doesn't give any error, but when i execute it crash!

When i debug the code it shows NULL in this portion;

myGraphicDriver = Handle(Graphic3d_GraphicDriver)::DownCast(((COCsdiApp*)AfxGetApp())->GetGraphicDevice()->GraphicDriver() );

How to get the graphic driver into the view?
I have to add any link?

2) if i use this code

try
{
myGraphicDevice = new Graphic3d_WNTGraphicDevice;
}
catch(Standard_Failure)
{
AfxMessageBox("Fatal Error During Graphic Initialisation");
}

Error:
new overloading operator can't take three parameters.

Can anybody help to solve this errors?

Regards
Saravana