- (void)init
{
    if (self = [super init])
    {
        // ...
        _toolbarSelection                   = [[CPImageView alloc] initWithFrame:CPRectMake(0,0,46,57)];
        [_toolbarSelection setAutoresizingMask:CPViewMinXMargin | CPViewMaxXMargin];
        [_toolbarSelection setBackgroundColor:[CPColor blueColor]];
        // ...
    }

    return self;
}

// ...

- (void)setMainToolbar:(CPToolbar)aToolbar
{
    _mainToolbar = aToolbar;
    [_mainToolbar._toolbarView addSubview:_toolbarSelection positioned:CPWindowBelow relativeTo:nil];
}


- (IBAction)didToolbarModuleClicked:(id)sender
{
     // ...
    //hack code for the background on the toolbarItem
	var selectionFrame = [_toolbarSelection frame],
        toolbarView = _mainToolbar._toolbarView,
        subviews = [toolbarView subviews],
        index = 0,
        count = [subviews count];

    for (; index < count; ++index)
    {
        var toolbarItemView = subviews[index];

        // if ([toolbarItemView._toolbarItem tag] === @"Personal")
        //      break;
    }
    //console.log(toolbarItemView);
    var frame = [toolbarItemView convertRect:[toolbarItemView bounds] toView:_mainToolbar._toolbarView];

    [_toolbarSelection setFrameOrigin:CGPointMake(CGRectGetMinX(frame) + (CGRectGetWidth(frame) - CGRectGetWidth(selectionFrame)) / 2.0, 0.0)];
    //end of hack

    // ...

}