CentralizedControl/HandyControl/HandyControl_Shared/Controls/Base/HeaderedSelectableItem.cs

using System.Windows;

namespace HandyControl.Controls;

public class HeaderedSelectableItem : SelectableItem
{
    public static readonly DependencyProperty HeaderProperty = DependencyProperty.Register(
        nameof(Header), typeof(object), typeof(HeaderedSelectableItem), new PropertyMetadata(default(object)));

    public object Header
    {
        get => GetValue(HeaderProperty);
        set => SetValue(HeaderProperty, value);
    }

    public static readonly DependencyProperty HeaderTemplateProperty = DependencyProperty.Register(
        nameof(HeaderTemplate), typeof(DataTemplate), typeof(HeaderedSelectableItem), new PropertyMetadata(default(DataTemplate)));

    public DataTemplate HeaderTemplate
    {
        get => (DataTemplate) GetValue(HeaderTemplateProperty);
        set => SetValue(HeaderTemplateProperty, value);
    }
}