show modal with stack holding external viewController

lib/ios/RNNModalManager.m

 -(void)showModal:(UIViewController *)viewController completion:(RNNTransitionCompletionBlock)completion {
 	self.toVC = (UIViewController<RNNRootViewProtocol>*)viewController;
 	_completionBlock = completion;
-	[self waitForContentToAppearAndThen:@selector(showModalAfterLoad:)];
+	
+	if ([self.toVC isCustomViewController]) {
+		[self showModalAfterLoad:nil];
+	} else {
+		[self waitForContentToAppearAndThen:@selector(showModalAfterLoad:)];
+	}
 }
 
 -(void)dismissModal:(NSString *)componentId {

lib/ios/RNNNavigationController.m

 	return NO;
 }
 
+- (BOOL)isCustomViewController {
+	return [((UIViewController<RNNRootViewProtocol>*)self.topViewController) isCustomViewController];
+}
+
 - (BOOL)isAnimated {
 	UIViewController<RNNRootViewProtocol>* rootVC = (UIViewController<RNNRootViewProtocol>*) self.topViewController;
 	return rootVC.isAnimated;