UIViewController Container APIs

To add a child view controller(VC) to a parent VC

[self addChildViewController:tradeVC];

[tradeVC didMoveToParentViewController:self];

[tradeVC release];

// and then add as a subview

[self.view addSubview: tradeVC.view];

while removing:

[self.view removeFromSuperview];

// and then remove from the parent VC

[self removeFromParentViewController];