WIn_RustTools/RustTools/Styles/TitleSubtitleControl.cs

using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;

namespace RustTools.Styles;
public sealed class TitleSubtitleControl : Control
{
    public TitleSubtitleControl()
    {
        DefaultStyleKey = typeof(TitleSubtitleControl);
    }

    public string TitleText
    {
        get => (string)GetValue(TitleTextProperty);
        set => SetValue(TitleTextProperty, value);
    }
    public static readonly DependencyProperty TitleTextProperty =
        DependencyProperty.Register("TitleText", typeof(string), typeof(TitleSubtitleControl), new PropertyMetadata(""));

    public string SubtitleText
    {
        get
        {
            return (string)GetValue(SubtitleTextProperty);
        }
        set
        {
            SetValue(SubtitleTextProperty, value);
        }
    }

    public static readonly DependencyProperty SubtitleTextProperty =
        DependencyProperty.Register("SubtitleText", typeof(string), typeof(TitleSubtitleControl), new PropertyMetadata(""));
}