My application needs to be able to expand a group via code, either in the CSOM or in code-behind.

My list bar is created via code and if I set the Expanded property to True while creating the groups it works fine.  But my interface is such that I want to be able to expand a group due to some external action.

I do not see a method to do this via the CSOM, nor does setting Expanded = true work in code-behind.

Is there something I'm missing?

Thanks...Steve