[DropDownList] - Need Default value selector option in dropdown list data type

[XeroDays]

Which Umbraco version are you using? (Please write the exact version, example: 10.1.0)

13.4.1

Bug summary

In this Datatype- this is really improtant in many cases where we have to assign a default value to the drop down, i have tried different code such as overriding PropertyValueConverterBase class but that is also not working.

Code on the controller which i have used to modify the data type,

using Umbraco.Cms.Core.Models.PublishedContent;
using Umbraco.Cms.Core.PropertyEditors;

public class NavBarDropdownPropertyValueConverter : PropertyValueConverterBase
{
    public override bool IsConverter(IPublishedPropertyType propertyType)
        => propertyType.EditorAlias.Equals("Umbraco.DropDown.Flexible");

    public override object ConvertSourceToIntermediate(IPublishedElement owner, IPublishedPropertyType propertyType, object source, bool preview)
    {
        if (source == null || string.IsNullOrEmpty(source.ToString()))
        {
            return "UnBranded Menu";  
        }

        return base.ConvertSourceToIntermediate(owner, propertyType, source, preview);
    }
}

Specifics

Steps to reproduce

1. Login to Umbraco CMS Backoffice.
2. Click on Settings tab.
3. Then click on DAta type
4. Create new Data type
5. Select DropDownList from the Selector.
6. Add items in teh Dropdown List items
7. Save it
8. Use the Datatype in any page
9. You will see defualt its taking as index 0;

Expected result / actual result

Here we should have an option for seelct a default value .

[github-actions[bot]]

Hi there @XeroDays!

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