You can try handling the Timeline MouseLeftButtonDown event and using this code:

private void Timeline_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)

        {

            IEnumerable<UIElement> uiElements = VisualTreeHelper.FindElementsInHostCoordinates(e.GetPosition(null), this.Timeline);

            foreach (UIElement uiElement in uiElements)

            {

                EventTitle eventTitle = uiElement as EventTitle;

                if (eventTitle != null)

                {

                    NumericTimeAxis axis = this.Timeline.Axis as NumericTimeAxis;

                    NumericTimeEntry entry = eventTitle.EventEntry as NumericTimeEntry;

                    axis.SelectedTime = entry.Time;

                }

            }

        }