TTURLAction applyAnimated doesn't animate

I currently use the Three20 framework for a project. But the following doe开发者_Go百科sn't work as aspected. It doesn't preform any animation, it simply pushes the screen directly on top.

[[TTNavigator navigator] openURLAction:[[TTURLAction actionWithURLPath:@"lp://miniapp/1"] applyAnimated:YES]];

I tested in the simulator and on the device.

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TTURLAction *urlAction=[[[TTURLAction alloc] initWithURLPath:strTTURL] autorelease];
urlAction.animated=YES;
[[TTNavigator navigator]openURLAction:urlAction];