How to set background color of bars

[nexig]

I need to set my bars look like this

any idea how to set white space above filled bar ?

[liuxuan30]

how about

    /// the color used for drawing the bar-shadows. The bar shadows is a surface behind the bar that indicates the maximum value
    public var barShadowColor = NSUIColor(red: 215.0/255.0, green: 215.0/255.0, blue: 215.0/255.0, alpha: 1.0)

[nexig]

It works perfect.

Thanks