Please, check the attached sample that demonstrates how to apply the desired color for each task of the recurrence. Basically, the Background of the custom TimeLineRecurrenceContainer should be bound to the one set for each Task.
As for your question concerning the setting the recurrence tasks during run-time you should not have any concerns - the sample also demonstrates how the task could be loaded during run-time and to be visualized as expected.
We hope this will help you.
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