// NativeMethods Class
using System;
using System.Runtime.InteropServices;

namespace RefreshNotificationArea
{
    internal class NativeMethods
    {
        [StructLayout(LayoutKind.Sequential)]
        internal struct RECT
        {
            public int left;
            public int top;
            public int right;
            public int bottom;
        }
        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        internal static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        internal static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass,
            string lpszWindow);

        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool GetClientRect(IntPtr hWnd, out RECT lpRect);

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        internal static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, int wParam, int lParam);
    }
}


// Main
using System;

namespace RefreshNotificationArea
{
    class Program
    {
        static void Main(string[] args)
        {
            RefreshTrayArea();
        }

        public static void RefreshTrayArea()
        {
            IntPtr systemTrayContainerHandle = NativeMethods.FindWindow("Shell_TrayWnd", null);
            IntPtr systemTrayHandle = NativeMethods.FindWindowEx(systemTrayContainerHandle, IntPtr.Zero, "TrayNotifyWnd", null);
            IntPtr sysPagerHandle = NativeMethods.FindWindowEx(systemTrayHandle, IntPtr.Zero, "SysPager", null);
            IntPtr notificationAreaHandle = NativeMethods.FindWindowEx(sysPagerHandle, IntPtr.Zero, "ToolbarWindow32", "Notification Area");
            if (notificationAreaHandle == IntPtr.Zero)
            {
                notificationAreaHandle = NativeMethods.FindWindowEx(sysPagerHandle, IntPtr.Zero, "ToolbarWindow32",
                    "User Promoted Notification Area");
                IntPtr notifyIconOverflowWindowHandle = NativeMethods.FindWindow("NotifyIconOverflowWindow", null);
                IntPtr overflowNotificationAreaHandle = NativeMethods.FindWindowEx(notifyIconOverflowWindowHandle, IntPtr.Zero,
                    "ToolbarWindow32", "Overflow Notification Area");
                RefreshTrayArea(overflowNotificationAreaHandle);
            }
            RefreshTrayArea(notificationAreaHandle);
        }

        private static void RefreshTrayArea(IntPtr windowHandle)
        {
            const uint wmMousemove = 0x0200;
            NativeMethods.GetClientRect(windowHandle, out NativeMethods.RECT rect);
            for (var x = 0; x < rect.right; x += 5)
            {
                for (var y = 0; y < rect.bottom; y += 5)
                {
                    NativeMethods.SendMessage(windowHandle, wmMousemove, 0, (y << 16) + x);
                }
            }
        }
    }
}