set frame viewcontrollers view in UINavigationController

set frame viewcontrollers view in UINavigationController

I'm trying to change the frame of VC does not work. this is my code:
AZControlViewController *vc = [[AZControlViewController alloc] init];
vc.tableView.frame = CGRectMake(0, 195, 320, 500);
self.vcMaster = [[[UINavigationController alloc]
initWithRootViewController:vc] autorelease];
AZControlViewController is a UITableViewController.
Can anyone help me?
Thanks!