crash in ComboBox coerce (not my code)

Question

I got the stack trace below reported from a customer. I don\'t know how to reproduce this. My WPF application has a fair number of ComboBoxes; I\'m not sure how to determine

Answer 1

We have a bespoke filtered combobox we made as a usercontrol that inherits from combobox. On Windows 10 machines we started to get this error for filtered comboboxes within forms on datagrid rows. We have a filtered combobox within the DataGrid.RowDetailsTemplate on a DataGrid.

To make the error go away we overrode this sub within our Filtered_Combobox class.

Protected Overrides Sub OnIsKeyboardFocusWithinChanged(e As DependencyPropertyChangedEventArgs)
    Try


    Catch ex As Exception
    End Try
End Sub

Note: We havent put any code in the override yet because it didnt seem to do anything (despite crash the application).