Help with AutoCompleteBox Styling

[BrunoDenisov]

Hello! I'm trying to style my AutoCompleteBox but I'm running into issues with it.

Here is a example of mt TextBox:
(As you can see when it's focused and active the BorderBrush is a red color

This is how my current AutoCompleteBox looks:
_A Tiny note, I did make a custom control based of the AutoCompleteTextBox that when the control gets focus it automatically opens the drop down menu since I use some pre-fetched values form my database.

public class DropdownAutoCompleteBox : AutoCompleteBox
{
    public DropdownAutoCompleteBox()
    {
        this.MinimumPopulateDelay = new TimeSpan(0);
        this.MinimumPrefixLength = 0;
        this.IsTextCompletionEnabled = true;
        this.FilterMode = AutoCompleteFilterMode.Contains;

        this.GotFocus += this.OnGotFocus;
    }

    private void OnGotFocus(object? sender, GotFocusEventArgs e) => this.IsDropDownOpen = true;

    protected override void OnDetachedFromVisualTree(VisualTreeAttachmentEventArgs e)
    {
        base.OnDetachedFromVisualTree(e);
        this.GotFocus -= this.OnGotFocus;
    }
}

Above is just an example of the Class, very basic

Below is a image how my current AutoCompleteBox looks:

This is how I've attempted to style it with a control theme in a global style axaml file so I can also incorporate themes into my app

     <ControlTheme x:Key="PrimaryAutoCompleteBox"
                  TargetType="AutoCompleteBox"
                  BasedOn="{StaticResource {x:Type AutoCompleteBox}}">
        <Setter Property="Background" Value="{DynamicResource PrimaryTextBoxBackground}" />
        <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBoxForeground}" />
        <Setter Property="BorderBrush" Value="{DynamicResource PrimaryTextBoxBorder}" />
        <Setter Property="FontFamily" Value="{StaticResource Ringside-Book}" />
        <Setter Property="CornerRadius" Value="8" />
        <Setter Property="Padding" Value="8,8,8,8" />

        <Style Selector="^ /template/ TextBox#PART_TextBox:focus">
            <Setter Property="BorderBrush" Value="{DynamicResource PrimaryTextBoxBorderFocused}"/>
            <!-- For testing only -->
            <Setter Property="Foreground" Value="Lime"/>
        </Style>
    </ControlTheme>

Above is to show that I did manage to change the Foreground property but no matter whatever I try, I just can't seem to get the BorderBrush property changed

Any advice is appreciated and in advance big thanks for any help