private void MessagesListBox_OnScrollChanged(object sender, ScrollChangedEventArgs e)
{
var scrollViewer =
VisualTreeHelperExtensions.GetDescendantByType((ListBox)sender, typeof(ScrollViewer)) as ScrollViewer;
if (scrollViewer.VerticalOffset == scrollViewer.ScrollableHeight)
{
_viewModel.AtListBottom = true;
scrollViewer.PageDown();
}
else
{
if (_viewModel.AtListBottom)
{
scrollViewer.ScrollToVerticalOffset(scrollViewer.VerticalOffset - 50);
}
_viewModel.AtListBottom = false;
}
}