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Unexpected crash during execution when you move a task to the left

Hi,

I have found a problem executing the GanttChart control.
As an example I have based on the solution published in this forum thread:

https://www.syncfusion.com/forums/166777/change-color-of-task-dynamically?reply=SE3uMF

The posted solution works perfectly, without any problems. You need to make a little change in it to start having the problem. 
The GanttChart is created like that:


                                   <sync:GanttControl x:Name="Gantt"

                                                                             Grid.Row="1"

                                   ItemsSource="{Binding TaskCollections}"
                                   UseAutoUpdateHierarchy="false"
                                   VisualStyle="Office2010Silver">

The change you have to make is delete UseAutoUpdateHierarchy or put it to True.

After that, during the execution, if you move a task, to the left for example, the application will crash.

I tested it in another solution, and the crash happens in the same way as in this solution when I change the value to true or delete this row.


Kind regards,

Jon