a simple way to define a image background of a window

I know that this is a simple exercise, but i can´t find the easy way to do this.
I need to insert an in mage as a background of my Cwnd.
The cwnd has a color background, and i want show an image over this background. Not necesaryly with the same size of the window.
Can anyone help me?

THANKYOU

PERE

https://www.codeguru.com/cpp/control...ound-image.htm
http://www.drdobbs.com/how-can-i-add...pape/184416746
https://social.msdn.microsoft.com/Fo...orum=vcgeneral
https://www.codeproject.com/Articles...your-MFC-dialo

Thank you for your help