Hello Nazar,

Currently we cannot promise an estimated time for a fix. We investigated the issue and there are no wrong calculations or properties with wrong values when the charts become shortened unexpectedly. This makes us think the origin of the problem is somewhere in the framework where heavy re-draw operations are performed in a moment of scrollviewer resize. This is only a hypothesis and we haven't isolated it yet. However, it seems to us that decreasing the charts in the Viewport can be a step in limiting this behavior. Our tests showed that placing all charts in a virtualized vertical listbox, instead of scrollviewer with stack panel limits the incorrect chart drawn a lot, but still after a lot of maximize /scroll/resize operations there might be some charts drawn incorrectly.

<Window
	x:Class="ChartsExample.MainWindow"
		xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
	xmlns:chartsExample="clr-namespace:ChartsExample">
	<ListBox  VirtualizingStackPanel.IsVirtualizing="True" ItemsSource="abcdefghijklmnopqrstuv" MaxHeight="800">
		<ListBox.ItemContainerStyle>
			<Style TargetType="ListBoxItem">
				<Setter Property="HorizontalContentAlignment" Value="Stretch" />
			</Style>
		</ListBox.ItemContainerStyle>
		<ListBox.ItemTemplate>
			<DataTemplate>
				<chartsExample:CartesianChart/>
			</DataTemplate>
		</ListBox.ItemTemplate>
   </ListBox>
</Window>

Regards,
Petar Mladenov
Progress Telerik

Hello Nazar,

I can confirm that this is an issue in the chart measure. This is why I've changed the status of the item to Unplanned (confirmed). The issue is related to the SmartLabelsMode of the axis. In your case this is the horizontal axis (the DateTimeContinuous one).

To work this around, you avoid setting the SmartLabelsMode property. Instead, you can leave the default range calculation of the chart. If this doesn't work for you, then you can manually adjust the range using the MajorStep and MajorStepUnit properties of the axis. Please try this idea and let me know how it goes.

Regards,
Martin Ivanov
Progress Telerik

Hi Nazar,

Thank you for the report. I am testing this and will get back to you later today.

Regards,
Martin Ivanov
Progress Telerik