void ViewScrollChanged(object sender, ScrollChangedEventArgs e)
{
ScrollViewer sv = e.OriginalSource as ScrollViewer;
topTreeScrollViewer = topTreeScrollViewer ?? topTree.GetScrollViewer();
leftTreeScrollViewer = leftTreeScrollViewer ?? leftTree.GetScrollViewer();
if (sv == this.scrollViewer) {
topTreeScrollViewer.SynchronizeScroll(sv, ScrollSyncOption.HorizontalToVertical);
leftTreeScrollViewer.SynchronizeScroll(sv, ScrollSyncOption.Vertical);
}
}
