Please, find attached an updated version of the user control, holding the chart in question. Note, that due to a pending change, the value converter contains dual implementation. Currently, the data context of the label is a string value, so you need to parse it in order to retrieve the DateTime value and format it as required. This will be updated and the context will be the DateTime value, so you will be able to remove the call to String.Parse
after 2012 Q1 SP1 is released.
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