How to sec color of each bars of histogram in ATAS c#

Question

I've tried to draw Weis Wave Histogram in ATAS using C#. But, in C# code, can't set each bar's color. How can I do this?

I've tried to use sample code provided by ATAS, but it was old version. I'm using Visual Studio 2022, and ATAS 6.1(this is the last version). Please Help me.