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Unable to control the Orientation of AutoComplete popup.

Hello I'm having a problem where the AutoComplete Control used in a DataTemplate has it's dropdown default to the orientation of the ItemPanelTemplate. If I set the orientation there it changes the orientation in the AutoComplete.

I have the AutoComplete contained in a StackPanel with the Orientation set to Vertical.

Psudo code follows:





Source="Custom" IsAutoAppend="True"
IsHistory="False" IsAutoCompleteItem="False"
IsFilter="True" Text="{Binding MyProperty}">