I would wish to oblige my RibbonView has to post a collapsed group as of the opening and some is the dimension of the window.
For that I tested:
pageGroup = new RadRibbonGroup()
Header = group.Key
collapsiblePanel = new RadCollapsiblePanel();
var variant = new GroupVariant(pageGroup, RibbonGroupVariant.Collapsed, 0);
But, when I run my application, the group isn't collapsed, I must resise my window to collapse it.
(sorry for my english)