#import "MyObject.h" 

@implementation  MyObject

- ( IBAction )myAction:( id )sender
{
NSSize siz = [myOutlet frame].size;
NSImage *img;
NSCustomImageRep *customImgRep = [[NSCustomImageRep alloc] initWithDrawSelector: @selector (draw) delegate: self ];
img = [[[NSImage alloc] initWithSize : siz] autorelease ];
[img addRepresentation:customImgRep];
[myOutlet setImage:img];

NSLog([[customImgRep delegate]className]);
}

-( void )draw
{
[[NSColor redColor] set];
[[NSBezierPath bezierPathWithOvalInRect : NSMakeRect( 20 , 0 , 100 , 100  )] fill ];
}

@end