NullReferenceException in Telerik.Windows.Controls.GridView.GridViewDataControl while expanding RadGridView in tabs

[tomsky]

Hi,

I'm using RadGridView with RadGridView.HierarchyChildTemplate (collapsed by default). When I have an layout with tabs and the grid in one layout and an item in another layout that changes the value of parent and child items, expanding the parent item gives the error added below. Please note that this error occurs only when you use tabs and only when the property of parent and child elements changes (string property). Our Telerik.Windows.Data.dll version is 2013.2.819.1050



<message>Object reference not set to an instance of an object.</message>
  <details>System.NullReferenceException: Object reference not set to an instance of an object.
   at Telerik.Windows.Controls.GridView.GridViewDataControl.&lt;&gt;c__DisplayClass44.&lt;Telerik.Windows.Data.IWeakEventListener&lt;System.ComponentModel.PropertyChangedEventArgs&gt;.ReceiveWeakEvent&gt;b__43()</details>
</exception> <exception>
  <id>29929938</id>
  <message>Object reference not set to an instance of an object.</message>
  <details>System.NullReferenceException: Object reference not set to an instance of an object.
   at Telerik.Windows.Controls.GridView.GridViewDataControl.&lt;&gt;c__DisplayClass44.&lt;Telerik.Windows.Data.IWeakEventListener&lt;System.ComponentModel.PropertyChangedEventArgs&gt;.ReceiveWeakEvent&gt;b__43()</details>
</exception>