Hello Stefan,
You could try to achieve this by adding the TextBlock in the
HorizontalTimelineGroupTemplate and through a Converter to set the TextBlock's
Text property. If the property to which you are binding is from your view model and it implements INotifyPropertyChanged Interface it should change the Text of the TextBlock accordingly.
I am sending you a sample project in which this approach is illustrated for displaying the Week numbers.
Hope it will help.
Greetings,
Konstantina
the Telerik team
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