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I have five workflows which are using a single activity and differentiating from each other through DependencyProperties. All of this is, of course, in Visual Studios 2010. Everything was working out quite well until a new requirement came through that changed the 'DependencyProperties' quite radically -- that is, I removed some and added others.

For four of the five workflows, things went quite well. I instantiated some variables in each one, hooked them up to the 'DependencyProperties' through designer, and it seems to have hooked up quite nicely. But, for that one final workflow, it won't even open in designer, saying that System.Workflow.ComponentModel.Design.IIdentifierCreationService is not installed.

I double and triple checked that the correct ProjectGuids are included in the project. In fact, that's the only way I can think of that I would be able to see the other four. What else can I check and/or change in order to get designer back on this particular workflow?

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