Last Updated: 20 Jun 2023 06:03 by ADMIN
Release LIB 2023.2.619 (19 Jun 2023)
The UI hangs when a custom interval (deriving from IntervalBase) is implemented and specific values are returned in its abstract method implementations.
Last Updated: 28 Sep 2021 15:04 by ADMIN
Release LIB 2021.3.1004 (4 Oct 2021)
The control's performance is low and in most cases the application hangs when you try to reset the control's zoom to its initial state. This happens in a scenario with big period range (for example 2 years) and when a MinuteInterval is defined. When you zoom-in to a level where the minutes are displayed and then you try to zoom out with the scrollbar (or if you change manually the VisiblePeriod to match the PeriodStart and PeriodEnd), the application hangs.

Remove the MinuteInterval from the Intervals collection just before changing the VisiblePeriod and then add it again in the collection. 

private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
    var interval = _timeline.Intervals.FirstOrDefault(i => i is Telerik.Windows.Controls.TimeBar.MinuteInterval);
    if (interval != null)
    _timeline.VisiblePeriod = new SelectionRange<DateTime>(_timeline.PeriodStart, _timeline.PeriodEnd);
    if (interval != null)
Last Updated: 21 Sep 2021 12:37 by ADMIN
Release LIB 2021.3.927 (27 Sep 2021)

If the RadTimeline control is placed in a DataTemplate and the ItemTemplateSelector property is set in XAML, the selector is never used.

This is not reproducible if the RadTimeline control is not in a DataTemplate.

To work this around set the ItemTemplateSelector property in code-behind, after the RadTimeline control is initialized. You can use the Loaded event of the control.

Last Updated: 29 Oct 2020 10:32 by ADMIN
Release R3 2020 SP1
WeakListener objects are retained in memory when the view is refreshed. 
Last Updated: 29 Oct 2020 09:56 by ADMIN
Release R3 2020 SP
When the models populating the ItemsSource of the RadTimeLine implement the INotifyPropertyChanged interface, TimeLineDataItem objects are retained in memory. 
Last Updated: 23 Aug 2019 15:00 by ADMIN
Release LIB 2019.2.826 (08/26/2019)

If you click on the collapse/expand button of a group (when the data is grouped) while you add or remove an item from the ItemsSource of RadTimeline, all items disappear.

To work this around set the AnimationManager.AnimationSelector attached property on all TimelineItemGroupControl elements to null. You can do this using an implicit style.

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


Last Updated: 26 Feb 2018 12:47 by ADMIN
RadTimeline throws OutOfMemoryException when you zoom to a small interval type (e.g. SecondInterval, MillisecondInterval) in case the control visualizes a very large period (e.g. 2-3 years). 

As a workaround you can limit the depth to which you can zoom using a larger value for the MinZoomRange property. Another way to go is to increase the IntervalSpans of the Interval. For example set IntervalSpans=500 in MillisecondInterval.
Last Updated: 04 Feb 2016 13:45 by ADMIN
The theme foreground is not applied on the group header when the theme is applied with StyleManager

For example: The foreground for the Expression_Dark theme should be #FFDDDDDD, but instead it is #FF000000
Last Updated: 26 Nov 2014 14:44 by ADMIN
The theme is not propagated to the TimelineStripLineControls when it is set on the timeline control with StyleManager. Which leads to the color of every second strip line using the default color for the Office_Black theme