Change default cursor for NumericUpDown inherited control?

[MechWarrior99]

I have a class that inherits from NumericUpDown, which extact the same, except a drag can be started over it to increase/decrease the value. The NumericUpDown is focused on PointerReleased if the pointer didn't move (with a margin of error) from the PointerPressed.
This is all to say that I want to replace the default IBeam cursor when the pointer is over the control with a SizeNorthSouth cursor.

This is the control theme for it that I have now.

 <ControlTheme x:Key="{x:Type views:DraggableNumericUpDown}" 
                          TargetType="views:DraggableNumericUpDown" 
                          BasedOn="{StaticResource {x:Type NumericUpDown}}">
                
    <Style Selector="^ /template/ TextBox#PART_TextBox">
        <Style Selector="^ ScrollViewer#PART_ScrollViewer">
            <Style Selector="^ /template/ ScrollContentPresenter#PART_ContentPresenter">
                <Setter Property="Cursor" Value="SizeNorthSouth" />
           </Style>
        </Style>
    </Style>
            
</ControlTheme>

This is an example of the best I could get, but as you can see it is still going to the IBeam.

AvaloniaApplication1.Desktop_2025-01-20_16-55-55.mp4

I've tried debugging but no luck.
This is the NumericUpDown.xaml, and this is the TextBox.xaml where I am trying to set the Cursor.

Any suggestions would be great!

[msneijders]

It is that Style directly on the ScrollViewer inside the TextBox that is preventing overruling the cursor probably. Don't know how to overrule it, maybe someone else knows.

But instead you could also try to set Cursor of its inner TextPresenter (and the watermark textblock):

    <ControlTheme
        x:Key="NumericUpDownTextBox"
        BasedOn="{StaticResource {x:Type TextBox}}"
        TargetType="TextBox">
        <Style Selector="^ /template/ TextPresenter#PART_TextPresenter">
            <Setter Property="Background" Value="Transparent" />
            <Setter Property="Cursor" Value="SizeNorthSouth" />
        </Style>
    </ControlTheme>

<ControlTheme x:Key="{x:Type views:DraggableNumericUpDown}"
                   TargetType="views:DraggableNumericUpDown"
                   BasedOn="{StaticResource {x:Type NumericUpDown}}">
  <Style Selector="^ /template/ TextBox#PART_TextBox">
    <Setter Property="Theme" Value="{StaticResource NumericUpDownTextBox}" />
  </Style>
</ControlTheme>