icon at left-top corner

[Sai]

I am trying to display an icon at left-top corner of DWT application.
I used following code and rc file, It is not working,  
DWTResourceManager.getImage is returning null

I am using rcc.exe to convert file.rc to file.res, and including file.res in
command line while building the app.

Can some one plese help me.
Thanks in advance
Sai



---- gui_file.d

Image img = DWTResourceManager.getImage("101", "ICOFILE");
shell.setImage(img);

---- file.rc 
101 ICON sunits.ico