objective c Drag And Drop IN OS X Sierra 10.12

Question

In OS X sierra 10.12 Drag and drop is not working properly with NSTabView.... Drag and drop seems to only work in label of TabView not the entire tab ..you can see in the following project sample...download Code OR here is code:-I have created a subClass AppMainTabSet OF NSTabView and use this class as a custom class of TabView In Interface Builder.....

 #import "AppMainTabSet.h"

@implementation AppMainTabSet


- (id)initWithCoder:(NSCoder *)coder
{
    /*------------------------------------------------------
     Init method called for Interface Builder objects
     --------------------------------------------------------*/
    self=[super initWithCoder:coder];
    if ( self ) {



    }
    return self;
}

- (void)awakeFromNib{

       [self registerForDraggedTypes:[NSArray arrayWithObject:NSFilenamesPboardType]];

    }


-(NSDragOperation) draggingEntered:(id < NSDraggingInfo >)sender
{
    NSLog(@"Hello Hello....draggingEntered");
    return NSDragOperationGeneric;
}




- (void)draggingExited:(id <NSDraggingInfo>)sender {
     NSLog(@"**** draggingExited*****");

}

- (BOOL) prepareForDragOperation:(id <NSDraggingInfo>)sender {
     NSLog(@"Hello Hello....prepareForDragOperation");
    return YES;
}



- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
{

    NSLog(@"Hello Hello....performDragOperation");

    return YES;
}

- (void)concludeDragOperation:(id <NSDraggingInfo>)sender {
   NSLog(@"Hello Hello....concludeDragOperation");

    [[NSCursor arrowCursor] push];
    [self setNeedsDisplay:YES];
}

- (BOOL) processNSDraggingInfo:(id <NSDraggingInfo>)sender {


   NSLog(@"Hello Hello....processNSDraggingInfo");

    return YES;
}