private void InitializeReactiveEvents()
{
var scheduler = new ControlScheduler(this);
var selectionDrag = (from mouseDown in MouseDown
where !overlayChannels &&
mouseDown.Button == MouseButtons.Left &&
MasterPane.FindChartRect(mouseDown.Location) == null
let startRect = (Rectangle?)GetNormalizedRectangle(MasterPane.Rect, mouseDown.Location, mouseDown.Location)
let previousSelection = MasterPane.PaneList.Select(pane => pane.Border.IsVisible).ToArray()
select Observable.Return(startRect).Concat(
(from mouseMove in MouseMove.TakeUntil(MouseUp)
.Sample(SelectionRefreshInterval, scheduler)
select(Rectangle?) GetNormalizedRectangle(MasterPane.Rect, mouseDown.Location, mouseMove.Location))
.Concat(Observable.Return <Rectangle?>(null)))
.Select(rect => new { previousSelection, rect }))
.Merge();
selectionNotifications = selectionDrag.Subscribe(xs => ProcessRubberBand(xs.previousSelection, xs.rect));
}