CPMenuItem issue when using removeAllItems when items are instantiated in the parent class.

gistfile1.j

/*
 * AppController.j
 * CPTableViewGroupRows
 */

@import <Foundation/CPObject.j>
@import <AppKit/CPMenu.j>
@import <AppKit/CPMenuItem.j>


@implementation AppController : CPObject
{
    CPMenu  _myMenu;
    CPMenuItem _anInstanceItem;

}

- (void)applicationDidFinishLaunching:(CPNotification)aNotification
{
     var theWindow = [[CPWindow alloc] initWithContentRect:CGRectMakeZero() styleMask:CPBorderlessBridgeWindowMask],
        contentView = [theWindow contentView];

    scrollView = [[CPScrollView alloc] initWithFrame:[contentView bounds]];
    tableView = [[CPTableView alloc] initWithFrame:CGRectMakeZero()];
    [tableView setUsesAlternatingRowBackgroundColors:YES];

    data = [[CPArray alloc] init];
    [data addObject:@"test"];
    [data addObject:@"another 1"];

    var theColumn = [[CPTableColumn alloc] initWithIdentifier:@"theColumn"];
    [[theColumn headerView] setStringValue:@"The Column"];

    [tableView addTableColumn:theColumn];
    [theColumn setMinWidth:300]
    [scrollView setDocumentView:tableView];

    [tableView setDataSource:self];
    [tableView setDelegate:self];

    [contentView addSubview:scrollView];
    [theWindow orderFront:self];

    _myMenu = [[CPMenu alloc] init];
    _anInstanceItem = [[CPMenuItem alloc] initWithTitle:"Instance item : This one will remain among futur right clicks" action:@selector(action:) keyEquivalent:nil];


}

- (int)numberOfRowsInTableView:(CPTableView)aTableView
{
    return [data count];
}

- (id)tableView:(CPTableView)aTableView objectValueForTableColumn:(CPTableColumn)aTableColumn row:(int)rowIndex
{
    return data[rowIndex];
}

- (BOOL)tableView:(CPTableView)aTableView isGroupRow:(int)rowIndex
{
    return rowIndex == 5;
}

-(void)action:(id)aSender
{
    var alert = [[CPAlert alloc] init];;
    [alert setTitle:"aTitle"];
    [alert setMessageText:"aText"];
    [alert runModal];
}

- (CPMenu)tableView:(CPTableView)aTableView menuForTableColumn:(CPTableColumn)aColumn row:(int)aRow;
{
    [_myMenu removeAllItems]; /* this is used to dynamicly build the CPMenu against the selected row
                                  but this is the source of the issue for instanciated items */

    [[_myMenu addItemWithTitle:"Not an Instance Item : Hightligh will not persist" action:@selector(action:) keyEquivalent:nil] setTarget:self];
    [[_myMenu addItem:_anInstanceItem] setTarget:self];
    return _myMenu;
}

@end