To reproduce:

Add a Resource to RadScheduler:

Resource res = new Resource();
res.Id = new EventId(199);
res.Name = "John Doe";

radScheduler1.Resources.Add(res);

Create a new appointment and set the resource:

Appointment app = new Appointment();

app.Start = DateTime.Now;
app.End = app.Start.AddHours(1);
app.BackgroundId = 3;
app.ResourceId = new EventId(199);

radScheduler1.Appointments.Add(app);

Subscribe to the CollectionChangedEvent:
void Appointments_CollectionChanged(object sender, Telerik.WinControls.Data.NotifyCollectionChangedEventArgs e)
{
    if (e.Action == Telerik.WinControls.Data.NotifyCollectionChangedAction.ItemChanged)
    {
        Debug.WriteLine("Property Changed = " + e.PropertyName);
    }
}

Run the application, open the appointment and click ok. You will notice that the event will fire. It should not fire since the EventId is the same.

Workaround:
Create a custom appointment following this article: http://www.telerik.com/help/winforms/scheduler-appointments-and-dialogs-adding-a-custom-field-to-the-editappointment-dialog.html and override the ResourceId property:

public class App : Appointment
{
    public override EventId ResourceId
    {
        get
        {
            return base.ResourceId;
        }
        set
        {
            if (!Object.Equals(this.ResourceId, value))
            {
                base.ResourceId = value;
            }
        }
    }
}

The request is covered here - http://feedback.telerik.com/Project/154/Feedback/Details/107090-fix-radscheduler-monthly-print-style-does-not-take-into-consideration-the-week

Resolution: 
In Q2 2014 we introduced new feature: WeeklyCalendarPrintStyle. More information you can find in our help: http://www.telerik.com/help/winforms/scheduler-print-support-schedulerprintstyle.html, section WeeklyCalendarStyle

1. In Day View, add an appointment for Thursday Jan 30
3. Click the Print Preview button
4. Click on the Print Settings dialog
5. Now change the Print style to Weekly.
Note that the DateRange now changes to Jan 27 - Feb 2. 
6. Now change the Print style to Monthly.
Note that the DateRange now changes to Jan 26 - Feb 2, whereas it should be Jan 26 to Feb 2, since the default week count is 4

To reproduce:
1. Create a new Form
2. Add a Scheduler control and set Dock to Dock.Fill
3. Run the form
4. Add an appointment to the scheduler
5. Right-click the newly added appointment and start dragging it to move the appointment
6. Let go of the mouse button to drop

You will notice that the appointment will not be dropped and the context menu will show. 

A correct behavior should be chosen.

Workaround:

Stop the appointments from dragging with right-mouse:

MouseButtons lastButton;
void scheduler_MouseDown(object sender, MouseEventArgs e)
{
    this.lastButton = e.Button;
}

void DragDropBehavior_Starting(object sender, RadServiceStartingEventArgs e)
{
    e.Cancel = lastButton == System.Windows.Forms.MouseButtons.Right;
}

EnableExactTimeRendering property should get or set a value indicating whether the appointment start and end time should be rendered exactly.

To reproduce:
Subscribe for the ContextMenuShowing event of RadScheduler and use the following code:
private void radScheduler1_ContextMenuShowing(object sender, SchedulerContextMenuShowingEventArgs e)
{
   e.ContextMenu.Items.Clear();
   e.ContextMenu.Items.Add(new RadMenuItem("Item"));
}

Right-Click on two appointments and you will notice the exception

Workaround:
Add three invisible items:
private void radScheduler1_ContextMenuShowing(object sender, SchedulerContextMenuShowingEventArgs e)
{
   e.ContextMenu.Items.Clear();
   e.ContextMenu.Items.Add(new RadMenuItem("Item"));
   for (int i = 0; i < 3; i++)
   {
       e.ContextMenu.Items.Add(new RadMenuItem() { Visibility = ElementVisibility.Collapsed });
   }
}

To reproduce:
- add RadScheduler with several appointments and use the folllowing code:
SchedulerDayView dayView = this.radScheduler1.GetDayView();
dayView.RangeFactor = ScaleRange.QuarterHour;
dayView.RulerStartScale = 7;
dayView.RulerEndScale = 18;

Ensure that you have appointments with start before 7 AM and appointments with start after 18 PM. All appointments with start before 7 AM are displayed at the top of the view, but all appointments with start after 18 PM are not displayed.

Workaround:
public Form1()
{
    InitializeComponent();

    for (int i = 0; i < 20; i++)
    {
        Appointment appointment = new Appointment(DateTime.Now.AddHours(12 + i), TimeSpan.FromMinutes(30), "Summary", "Description");
        appointment.StatusId = 2;
        appointment.BackgroundId = 6;
        this.radScheduler1.Appointments.Add(appointment);
    }

    SchedulerDayView dayView = this.radScheduler1.GetDayView();
    dayView.RangeFactor = ScaleRange.QuarterHour;
    dayView.RulerStartScale = 7;
    dayView.RulerEndScale = 18;

    this.radScheduler1.AppointmentElementFactory = new CustomAppointmentElementFactory();
}

public class CustomAppointmentElementFactory : IAppointmentElementFactory
{
    AppointmentElement IAppointmentElementFactory.CreateAppointmentElement(RadScheduler scheduler, SchedulerView view, IEvent appointment)
    {
        return new CustomAppointmentElement(scheduler, view, appointment);
    }
}

public class CustomAppointmentElement : AppointmentElement
{
    public CustomAppointmentElement(RadScheduler scheduler, SchedulerView view, IEvent appointment) : base(scheduler, view, appointment)
    {
    }

    protected override void OnParentChanged(Telerik.WinControls.RadElement previousParent)
    {
        base.OnParentChanged(previousParent);

        if (this.Scheduler.ActiveViewType == SchedulerViewType.Day)
        {
            if (this.Start.Hour > this.Scheduler.GetDayView().RulerEndScale)
            {
                this.Start = this.Start.Date.AddHours(this.Scheduler.GetDayView().RulerEndScale).AddMinutes(-(int)this.Scheduler.GetDayView().RangeFactor);
            }
        }
    }
}

Description:
When the appointment is moved (dragged and dropped) from one resource to another resource in Timeline view only, the AppointmentDropped event is not fired. This results in NullReferenceException in Windows 8.

To reproduce:
- add RadScheduler in Timeline view and use the following code:

List<Appointment> appointmentlist = new List<Appointment>();

public Form1()
{
InitializeComponent();

this.radScheduler1.Resources.Add(new Resource { Id = new EventId("1"), Name = "Jack", Visible = true });
this.radScheduler1.Resources.Add(new Resource { Id = new EventId("2"), Name = "John", Visible = true });
this.radScheduler1.Resources.Add(new Resource { Id = new EventId("3"), Name = "John", Visible = true });

this.radScheduler1.GroupType = GroupType.Resource;
this.radScheduler1.GetDayView().DayCount = 1;

Random rand = new Random();
for (int i = 0; i < 20; i++)
{
Appointment appointment = new Appointment(DateTime.Now, TimeSpan.FromMinutes(30), "Summary", "Description");
appointment.StatusId = rand.Next(1, radScheduler1.Statuses.Count);
appointment.BackgroundId = rand.Next(1, radScheduler1.Backgrounds.Count);
appointment.ResourceId = radScheduler1.Resources[rand.Next(0, radScheduler1.Resources.Count)].Id;
appointmentlist.Add(appointment);
}

this.radScheduler1.Appointments.BeginUpdate();
this.radScheduler1.Appointments.AddRange(this.appointmentlist.ToArray());
this.radScheduler1.Appointments.EndUpdate();
this.radScheduler1.AppointmentDropped += radScheduler1_AppointmentDropped;
}

private void radScheduler1_AppointmentDropped(object sender, AppointmentMovedEventArgs e)
{
MessageBox.Show("Dropped");
}

Workaround: use custom DragDropBehavior as follows:
this.radScheduler1.SchedulerElement.DragDropBehavior = new CustomDragDrop(this.radScheduler1.SchedulerElement);


public class CustomDragDrop : AppointmentDraggingBehavior
{
public CustomDragDrop(SchedulerVisualElement activeOwner) : base(activeOwner)
{
}

public override void Drop()
{
DateTime start = this.ActiveFeedback.Scheduler.SystemTimeZone.OffsetTime(this.ActiveFeedback.Appointment.Start, this.ActiveFeedback.View.DefaultTimeZone);
DateTime end = this.ActiveFeedback.Scheduler.SystemTimeZone.OffsetTime(this.ActiveFeedback.Appointment.End, this.ActiveFeedback.View.DefaultTimeZone);

IEvent ev = this.ActiveFeedback.AssociatedAppointment;
bool changeResourceId = (this.Scheduler.GroupType == GroupType.Resource) &&
(this.ActiveFeedback.Appointment.ResourceId != this.ActiveFeedback.AssociatedAppointment.ResourceId ||
this.ActiveFeedback.Appointment.ResourceIds.Count != this.ActiveFeedback.AssociatedAppointment.ResourceIds.Count);

AppointmentMovingEventArgs cancelArgs = (this.Scheduler.GroupType != GroupType.Resource) ? new AppointmentMovingEventArgs(start, ev) :
new AppointmentMovingEventArgs(start, ev, this.ActiveFeedback.Appointment.ResourceId);

this.OnAppointmentDropping(cancelArgs);

this.ActiveOwner.Scheduler.GetType().GetMethod("OnAppointmentDropping", BindingFlags.NonPublic |
BindingFlags.Instance).Invoke(this.ActiveOwner.Scheduler, new object[] { cancelArgs });

if (cancelArgs.Cancel)
{
this.Stop(false);
return;
}

this.ActiveFeedback.Scheduler.Appointments.BeginUpdate();

if (this.ActiveOwner as DayViewAllDayHeader != null && this.ActiveFeedback.Appointment.Duration < new TimeSpan(1, 0, 0, 0))
{
start = this.ActiveFeedback.Appointment.Start.Date;
end = DateHelper.GetEndOfDay(this.ActiveFeedback.Appointment.End);

start = this.ActiveFeedback.Scheduler.SystemTimeZone.OffsetTime(start, this.ActiveFeedback.View.DefaultTimeZone);
end = this.ActiveFeedback.Scheduler.SystemTimeZone.OffsetTime(end, this.ActiveFeedback.View.DefaultTimeZone);
}

this.ActiveFeedback.AssociatedAppointment.Start = start;
this.ActiveFeedback.AssociatedAppointment.End = end;

if (changeResourceId)
{
this.ActiveFeedback.AssociatedAppointment.ResourceId = this.ActiveFeedback.Appointment.ResourceId;
}

RadScheduler scheduler = this.ActiveOwner.Scheduler;
if (scheduler.DataSource != null)
{
scheduler.DataSource.GetEventProvider().Update(this.ActiveFeedback.AssociatedAppointment, "Start");
scheduler.DataSource.GetEventProvider().Update(this.ActiveFeedback.AssociatedAppointment, "End");
scheduler.DataSource.GetEventProvider().Update(this.ActiveFeedback.AssociatedAppointment, "Duration");
if (changeResourceId)
{
scheduler.DataSource.GetEventProvider().Update(this.ActiveFeedback.AssociatedAppointment, "ResourceId");
scheduler.DataSource.GetEventProvider().Update(this.ActiveFeedback.AssociatedAppointment, "ResourceIds");
}
}

while (!this.ActiveFeedback.Scheduler.Appointments.IsUpdated)
this.ActiveFeedback.Scheduler.Appointments.EndUpdate(true);

AppointmentMovedEventArgs args = (this.Scheduler.GroupType != GroupType.Resource) ? new AppointmentMovedEventArgs(start, ev) :
new AppointmentMovedEventArgs(start, ev, this.ActiveFeedback.Appointment.ResourceId);

this.HideFeedbacks();
SchedulerUIHelper.SelectAppointment(this.Scheduler, ev, true, false);

this.OnAppointmentDropped(args);
this.ActiveOwner.Scheduler.GetType().GetMethod("OnAppointmentDropped", BindingFlags.NonPublic |
BindingFlags.Instance).Invoke(this.ActiveOwner.Scheduler, new object[] { args });
}
}

Add the ability to change the width of the group headers when the scheduler is grouped by Resource.

Resolution: You can set the size using code snippet: 
((SchedulerViewGroupedByResourceElementBase)this.radScheduler1.ViewElement).SetResourceSize(0, 0.5f);

To reproduce:
Add a RadScheduler with a database with appointments. In the recurrence rule of the appointments add the keyword FREQ with value MONTHLY- FREQ=MONTHLY;UNTIL=20140102T235959Z;BYDAY=TH;WKST=SU

You will notice that despite that the frequency of the recurrence is weekly.

To reproduce:
Add a RadScheduler and a database with appointments. Set the recurrence rule to the following:
FREQ=WEEKLY;UNTIL=20140102;BYDAY=TH;WKST=SU

A first chance exception will be thrown and the appointments will not show correctly.

Workaround:
Before setting the recurrence rule make sure that the UNTIL keyword's value is in the following format: 20140102T235959Z or more specifically - yyyyMMdd\\THHmmss\\Z

To reproduce:
Create a SQL table as per this article - http://www.telerik.com/help/winforms/scheduler-data-binding-using-datasource-property.html . Add the following mappings using EntityFramework or OpenAccess - http://www.telerik.com/help/winforms/scheduler-data-binding-using-datasource-property.html. You will notice that the resources cannot be mapped.
Workaround:
Implement a One-to-Many relation by adding a ResourceId column in the database and removing the old table.

Resolution: Both EF and TDA mappings work. Due to the differences in the mechanisms of the two products there are some slight adjustments that need to be made. Below is how to set up the mappings with EF and in commented code for ORM.
SchedulerDataEntities1 entityContext = new SchedulerDataEntities1();

Add an option for SchedulerMonthlyPrintStyle to show the text of the appointments, not only the dates.

Expose some of the printing methods to allow derived classes to override them for greater customization support.

To reproduce:
Add an appointment with the text "<html><size=9>Erin Swardz</br><color=Red>PO 2315</html>" the appointment looks formatted in the scheduler, however when in PrintPreview/Print the html code is printed in raw format

Workaround:
Strip all html in order to print pure text - 
void scheduler_AppointmentPrintElementFormatting(object sender, PrintAppointmentEventArgs e)
{
    string replaceBr = e.AppointmentElement.Text.Replace("</br>", " ");
    string result = Regex.Replace(replaceBr, @"<[^>]*>", string.Empty);
    e.AppointmentElement.Text = result;
}

RadScheduler - Implement functionality that will allow clients to define which time intervals should be visible in TimeLine view.

To reproduce: 
Add a RadScheduler to a form and try the following method : 
private void Scroll() 
 { 
     SchedulerDayView dayView = radScheduler1.GetDayView(); 
     SchedulerWeekView weekView = radScheduler1.GetWeekView(); 
     dayView.RulerStartScale = 7; dayView.RulerEndScale = 22; 
     if (radScheduler1.ActiveViewType == SchedulerViewType.Day) 
       { 
          if (dayView != null) 
             { 
                dayView.RangeFactor = ScaleRange.QuarterHour; 
             } 
       } 
       else  if (radScheduler1.ActiveViewType == SchedulerViewType.Week) 
       {
         if (weekView != null) 
             { weekView.RangeFactor = ScaleRange.QuarterHour; 
             } 
       } 

dayView.RulerTimeFormat = RulerTimeFormat.hours24; 
SchedulerDayViewElement dayViewElement = this.radScheduler1.SchedulerElement.ViewElement as SchedulerDayViewElement; 
if (dayViewElement != null)
 { 
      dayViewElement.DataAreaElement.Table.ScrollToTime(new TimeSpan(DateTime.Now.Hour, 0, 0)); 
  } 
} 

As you can see the scroll is not correct.

Add the NavigateBackwardsButton and NavigateForwardsButton's text to the localization provider.

DECLINE REASON:
The text in these buttons was visible due to an issue in the Aqua theme. The text of these buttons is not visible in any theme by design therefore this item will be declined as its implementation will be redundant.

When printing the timescale in the printed document should be the same as in the scheduler or with option for changing.

Paint event should be thrown when a SchedulerCellElement is painting.