change postion of ribbongroup

I am now using the Ribbon control

I want to change position of Ribbongroup  

I want to change the groupindex so that RibbonGroupSettings stay on the last position depending on the visibility
of RibbongroupRoadMap

This doesnt work:

In FormCreate or FormShow:

if not RibbonGroupRoadMap.Visible
Begin;
  RibbonGroupSettings.Groupindex := 3;
  RibbonGroupRoadMap.GroupIndex:= 4;
End;

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Groupindex is not changed and ribbonGroupSettings is on the same place (after roadmap)  ?
Can anybody give an explanation and a solution ?