We are a little confused from your explanation - we are not sure how your diagrams are on top of each other and how this is related to bring totop/ tofront / forward issue. However, since your version is old and you may have hit an old issue in RadDiagram, we highly encourage you:
- either to upgrade to the latest version and check if this is still reproducible
- or work only with Canvas.ZIndex attached property. Instead of using the Diagram Commands simply introduce methods which control the ZIndex property.
If these are not an options for you please elaborate a bit more on your scenario with some sample code and what you expect exactly.
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and share your thoughts.