We have tried to use this tooltip service to extend the show duration to 30 seconds with a dynamical, databinding DataGrid to show some cell information.  We have met the issue of not-closing tooltips -- same tooltip popup can occur many times and unable to close...

We are forced to roll back to the default tooltip service, which only shows tooltips for 5 seconds.

We do not need any animation to bring up a tooltip, only extend its life so that the user have time to read the info in it.

Could someone give me a hint as to how to fix tooltips do not close issue?

I have added the following methods ToolTipService class:

        public static void CloseAllToolTips()
        {
            lock (locker)
            {
                if (elementsAndToolTips.Count > 0)
                {
                    foreach (var kvp in elementsAndToolTips)
                    {
                        kvp.Value.IsOpen = false;
                        kvp.Value.Timer.StopAndReset();
                    }
                }
            }
        }

        public static void RemoveAllToolTips()
        {
            lock (locker)
            {
                if (elementsAndToolTips.Count > 0)
                {
                    foreach (var kvp in elementsAndToolTips)
                    {
                        kvp.Value.IsOpen = false;
                        kvp.Value.Timer.StopAndReset();
                    }
                }
                elementsAndToolTips.Clear();
            }
        }

to close the tooltips with some event, but still see some tooltips do not go away.