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//Si no es ninguno de los predefinidos aquí: https://developer.apple.com/reference/uikit/uibarbuttonsystemitem?language=objc

//hacer:

		UIButton *button1=[UIButton buttonWithType:UIButtonTypeCustom];
		[button1 setFrame:CGRectMake(0, 0, 24.0, 15.0)];
		[button1 addTarget:self action:@selector(barButtonRequestTapped:) forControlEvents:UIControlEventTouchUpInside];
		[button1 setImage:[UIImage imageNamed:@"requestable.png"] forState:UIControlStateNormal];
		UIBarButtonItem *barButtonRequest = [[UIBarButtonItem alloc]initWithCustomView:button1];
		
		[rightItems addObject:barButtonRequest];