Please take a look at these examples from our examples suite that demonstrate annotations with DateTimeAxis:
Both examples set X coordinates (DateTime) in code, but you can do the same in XAML.
Hope this helps! Please let us know if you have any troubles with this,
In fact, I already use DateTime axis in XAML code.
The problème is, when I draw manualy some annotation, X value are considered as number value.
Then if I change the main series value, annotations don’t stay on datetime value, but moved :/
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