HistoryViewModel.cs

using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.Windows;
using DbgX.Interfaces;
using DbgX.Util;

namespace WinDbgExt.History
{
    [RibbonTabGroupExtensionMetadata("ViewRibbonTab", "Windows", 5), Export(typeof(IDbgRibbonTabGroupExtension))]
    public class HistoryViewModel : IDbgRibbonTabGroupExtension
    {
        public HistoryViewModel()
        {
            ShowCommand = new DelegateCommand(Show);
        }

        public DelegateCommand ShowCommand { get; }

        public IEnumerable<FrameworkElement> Controls => new[] { new HistoryButton(this) };

        private void Show()
        {
            // TODO
        }
    }
}