Drawing bitmaps with "Large fonst" or "Small fonts" system settings

Hi all !

I've designed some dialog form in the Developer's Studio resource editor and reserved some place in the dialog with a control (rectangle or frame)to draw DIB instead of that control. I've done it all with "Large fonts" system setting and when I run my project on another computer with "Small fonts" I was surprised. All controlls become smaller proportionally, by the size of my DIB is not dynamic. It's 320x240 pixels. As a result the DIB covered some controls by himself. How can I prevent it ?! How is it possible to draw a DIB with 320x240 pixels dimensions with ANY system settings without covering other controls ?
How can I reserve exactly 320x240 pixels in the resource editor ? I've found the solution in scaling my DIB according to the size of my placeholder, but in the future I must draw a DIB with exactly 320x240 pixels dimensions.
I'm using VC++ 6.0. I hope somebody knows how to cope with this problem.