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Could somebody please provide a "Hello, World" type example for creating a custom control that subclasses CExtScrollWnd? For example, something that just draws a circle, and then displays the scrollbars when the dialog is resized smaller than the circle.

I know that the grid and image editor controls extend CExtScrollWnd, but wading through hundreds of lines of code to find the minimum necessary lines is proving to be a tedious task.

Thanks.

Here is a simple CExtScrollWnd-based project. The CChildView class in it is what you need to start developing your scrollable windows.

Here is a more complex example which implements a scrollable window based on a floating point coordinate space with normalized regions between 0.0 and 1.0 plus simple graph control with editing and scaling: