I had this same problem and solved it using built in WPF functionality.

 In your resources define your group content ie.

<igRibbon:ToolHorizontalWrapPanel x:Key="ShareMe" x:Shared="false">

<igRibbon:ToolHorizontalWrapPanel>

The important part is x:Shared="false" this means the content will be created new each time the resource is requested.  Without specifying x:Shared="false" the items won't be allowed to belong to different trees.

Later in your ribbon you can reference the content like so:

<igRibbon:RibbonGroup Id="GroupOneObjects" Caption="GroupOneObjects">

  <StaticResourceExtension ResourceKey="ShareMe" />

</igRibbon:RibbonGroup>

Never mind. I got it. If at all some one came across same issue.

 I removed the ribbon group from the existing tab and added to the one I needed.

vRibGrp = this.utbBookScan.Ribbon.Tabs["Tools"].Groups["XXX"];

Hello jody-

 It's little surprising that this feature doesn't exist. If possible can you provide the sample code.

Thanks!

 Hello Mike,

Thank you for your reply.  I am sure it will be nice to have as a feature in the future...

In the mean-time, I have been able to produce the desired results with minimal code and effort.

I use the AfterRibbonSelect event to remove the "Shared" Group from its "Current" Tab and then move it to the New Tab's group list.

Its simple and effective - Only 2 lines of code....

If anyone is interested I could actually post a sample of the code.

Thank you,

Jody