Disabling "Complete" for tasks based on a condition

I am trying to disable the "Complete" button on any user task in a Case if any of the Checklist entries have not been completed for that Case. Does anyone know of a way to achieve this or have any examples ?

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Run a process from the case that carries out the checks (displaying messages if errors) before creating the task?

Gareth Osler,

Thanks for the reply however this assumes the checking should be done when creating a task. I need to be able to intercept the hover over an existing task and at that point check the criteria and either enable or disable the "Complete" button before it appears against the task.

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