I have  a simple autocompleting editable dropdown. It does not accept umlauts (äöåü) from keyboard. If I copy-paste the character, then it will be entered and autocompleted.

Selecting items with keyboard is also broken, one can't select an item without writing a letter first. The letter also must be the first one of entry, if one has "Contains" comparision operator, you can't select any item with keybord.

Setup:

...

Loaded += (s, e) => {

                xamAutoComp.DataContext = (from str in new[] { "auli", "ääni", "paakayttaja", "pääkäyttäjä" }                                            select new SWrap { Data = str }).ToList();            };

...

public class SWrap { public string Data { get; set; } }

xaml:

<ig:XamComboEditor 

            Name="xamAutoComp" Width="160" Height="22"

            ItemsSource="{Binding}"            

            CustomValueEnteredAction="Allow"

            EmptyText="Empty"

            IsEditable="True"

            AutoComplete="True"

            DisplayMemberPath="Data"            

            AllowFiltering="True">            

            <ig:XamComboEditor.CustomItemsFilter>

                <ig:ItemsFilter>

                    <ig:ItemsFilter.Conditions>                        

                        <ig:ComparisonCondition Operator="Contains" />

                    </ig:ItemsFilter.Conditions>

                </ig:ItemsFilter>

            </ig:XamComboEditor.CustomItemsFilter>

        </ig:XamComboEditor>