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The way to do this would be with a custom command widget in the sidebar. Here's a blogpost by Stoimen Stoimenov that shows how to implement the same functionality ApprovalWorkflow state:
The only thing different for you would be the filter expression. The format for the filter expression that you should use in your case would be:
"fieldName.Contains((GUID))" where GUID is the ID of the item by which you want to filter.
Let us know if this worked for you.