OK.   Thanks for your help. ^_^

Hello Charlie,

Yes that is right, because the XamZoombar is a complicated control and the border you want to make thinner is in fact a custom control. You can also add a ResourceDictionary and put the Style there, if you don't want to put it in XAML.

Hope this helps you. 

Thanks.  

So if I want to implement this functionality, I have to copy this default style into my XAML file, and do some change? Because I find that the default style xaml code is about 900 line~~~

Hello Charlie,

You can find the default Styles here by default:

C:\Program Files (x86)\Infragistics\NetAdvantage 2013.1\WPF\DefaultStyles

Hi Stefan ,

Thanks for your response, and where can I find the default style of these control?