Special Custom Checkmark in UITableViewCell
#define CHECKBOX_TAG 123

UIView *customAccessoryView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 60, 30)] autorelease];
UIImageView *otherInfo = [[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 30, 30)] autorelease];
UIImageView *checkbox = [[[UIImageView alloc] initWithFrame:CGRectMake(30, 0, 30, 30)] autorelease];
checkbox.tag = CHECKBOX_TAG;
[customAccessoryView addSubview:otherInfo];
[customAccessoryView addSubview:checkbox];
cell.accessoryView = customAccessoryView;

UIImageView *checkbox = [cell.accessoryView viewWithTag:CHECKBOX_TAG];
if(selected){
    checkbox.hidden = NO;
}else{
    checkbox.hidden = YES;
}

@property(nonatomic) UITableViewCellAccessoryType accessoryType

@property(nonatomic, retain) UIView *accessoryView