Open Taskbar's Calendar using UI Automation

Program.cs

using System;
using System.Runtime.InteropServices;
using UIAutomationClient; // add a COM reference to Windows\System32\UIAutomationCore.dll, and set "Embed Interop Types" to false on this reference's properties

namespace ConsoleApp
{
    internal class Program
    {
        private static readonly CUIAutomation8 _ui = new CUIAutomation8();

        static void Main()
        {
            var handler = new AutomationEventHandler();
            var root = _ui.GetRootElement();
            _ui.AddAutomationEventHandler(UIA_EventIds.UIA_Window_WindowOpenedEventId, root, TreeScope.TreeScope_Children, null, handler);
            var taskbar = root.FindFirst(TreeScope.TreeScope_Children, _ui.CreatePropertyCondition(UIA_PropertyIds.UIA_ClassNamePropertyId, "Shell_TrayWnd"));
            // or var taskbar = root.FindFirst(TreeScope.TreeScope_Children, ui.CreatePropertyCondition(UIA_PropertyIds.UIA_NamePropertyId, "Taskbar"));
            var clockButton = taskbar.FindFirst(TreeScope.TreeScope_Subtree, _ui.CreatePropertyCondition(UIA_PropertyIds.UIA_ClassNamePropertyId, "TrayClockWClass"));
            var invoke = (IUIAutomationInvokePattern)clockButton.GetCurrentPattern(UIA_PatternIds.UIA_InvokePatternId);
            invoke.Invoke();

            Console.ReadLine();
        }

        private class AutomationEventHandler : IUIAutomationEventHandler
        {
            public void HandleAutomationEvent(IUIAutomationElement sender, int eventId)
            {
                // TODO: add some checks on the sender
                var handle = sender.CurrentNativeWindowHandle;
                var rc = sender.CurrentBoundingRectangle;
                MoveWindow(handle, 100, 100, rc.right - rc.left, rc.bottom - rc.top, false);
            }

            [DllImport("user32")]
            private static extern bool MoveWindow(IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint);
        }
    }
}