Accessing Label of storyboard in Other File

Hello. I hope this is the proper place to go within kind of question. I am using Xcode 5 and am having a small access problem. I have my label, created as a variable in VC.h:
@interface ViewController : UIViewController{
    IBOutlet UILabel *label1;

The code to change the background color of the label is in another .m(not VC.m):
self.myobject->my label.backgroundColor = [UIColor redColor];

My program runs fine until here, when I get a light green "error" that says "EXC_BAD_ACCESS" How do I access the label properly and change their background color, but not from VC.m? Thanks!
OK so now I have made the labels properties of ViewController. They are accessed from an object of VC, but still nothing happens.
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