Expanding or Collapsing Groups While New Items are Added Cause the RadTimeline to Display No Items

Environment

Product Version 2019.1.220
Product RadTimeline for WPF

Description

Expanding or collapsing groups, while new items are being added, can cause the RadTimeline control to display no items at all.

Workaround

Disable the collapse/expand animations. You can do this via an implicit style that targets the TimelineItemGroupControl, and set the AnimationManager.AnimationSelector attached property to null.

<Window.Resources> 
    <Style TargetType="telerik:TimelineItemGroupControl"> 
        <Setter Property="telerik:AnimationManager.AnimationSelector" Value="{x:Null}" /> 
    </Style> 
</Window.Resources> 

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