SVANVOORST@... wrote: > For those interested in core graphics, this code creates a custom > round slider and demonstrates CG rotation with zoom. Several new > toolbox functions are required. 10.4 recommended. Cocoa has a > round slider, but it is not available for Carbon. < code snipped > I copied the demo from Mail and pasted it into an untitled editor window. A familiar-but-repairable mangling of space characters prevents it from being compiled. (1) Replace all option-spaces by ordinary spaces, with FB's Find/ Change dialog. (2) Type a space in front of each assembler instruction (each line between beginassem/endassem). The demo then worked, and is both instructive and whizzy. OS X 10.4 is not merely "recommended" but essential, because some API calls (CGContextAddEllipseInRect, CGContextFillEllipseInRect) did not exist in 10.3.9. Robert P.