How to prevent databound combobox from automatically selecting the last item?

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I have the following data bound ComboBox, and it insists on automatically selecting the last item when loaded. Anyway to get it to load with nothing selected?

C#

<ComboBox Name="ComboBoxResourceAdd" IsEditable="False" IsReadOnly="True" SelectedValue="" ItemsSource="{Binding Mode=OneWay, RelativeSource={RelativeSource AncestorType=Window}, Path=DataContext.ResourcesView}" DisplayMemberPath="Name" SelectedValuePath="ID"/>

To be clear, I am only trying to populate the dropdown choices for the user, not bind the selection back to any object.

What I have tried:

I have tried placing SelectedValue = "" before and after the ItemsSource property set. When I place SelectedIndex = "0" it will successfully select the first item instead of the last, but when I try SelectedIndex = "-1" it goes back to automatically selecting the last item. Any help appreciated.

Posted 4-Jun-20 9:47am

greatoceansoftware

Updated 4-Jun-20 12:39pm

v3

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greatoceansoftware · Answer 1 · 2020-06-04T12:40:00

Sorry for the trouble. Found the solution:

The ResourcesView used to populate the list was in use in other places in the application, and was synching all controls bound to it.

So setting the IsSynchronizedWithCurrentItem=False on all the ComboBoxes that were using it in this read-only manner was needed. Other list controls elsewhere need the synchronization.