The attached picture is a ribbon bar chunk in an application we purchased. I would like to copy that style on one of my ribbon bar chunks. I haven't found out how to make the separator and the smaller button elements. How can I do that?
Our RadRibbonBar not supports separator elements. The control is designed to split the buttons in groups and it is not using separators to do this. However you can achieve similar look with customization of the borders of the group, just like we did in the Office2010Back theme for example. You can take a look at our Theme Viewer application that demonstrates all themes.
Also you can take a look at the attached demo project where I made some customizations of the ControlDefault theme so it will look similar to your screenshot.
I hope this helps. Should you have any other questions, I will be glad to assist you.