Some adjustments for all day items control. Removed the leaking part.

Wino.Core.Domain/Collections/CalendarEventCollection.cs

@@ -26,9 +26,10 @@ namespace Wino.Core.Domain.Collections
 
         public CalendarEventCollection(ITimePeriod period)
         {
+            Period = period;
+
             RegularEvents = new ReadOnlyObservableCollection<ICalendarItem>(_internalRegularEvents);
             AllDayEvents = new ReadOnlyObservableCollection<ICalendarItem>(_internalAllDayEvents);
-            Period = period;
         }
 
         public bool HasCalendarEvent(AccountCalendar accountCalendar)

Wino.Core.Domain/Entities/Calendar/CalendarItem.cs

@@ -38,6 +38,22 @@ namespace Wino.Core.Domain.Entities.Calendar
             }
         }
 
+        public bool IsAllDayEvent
+        {
+            get
+            {
+                return StartDate.TimeOfDay == TimeSpan.Zero && EndDate.TimeOfDay == TimeSpan.Zero;
+            }
+        }
+
+        public bool IsMultiDayEvent
+        {
+            get
+            {
+                return StartDate.Date != EndDate.Date;
+            }
+        }
+
         public double DurationInSeconds { get; set; }
         public string Recurrence { get; set; }
 

Wino.Core.Domain/Interfaces/ICalendarItem.cs

@@ -12,5 +12,7 @@ namespace Wino.Core.Domain.Interfaces
         DateTime EndDate { get; }
         double DurationInSeconds { get; set; }
         ITimePeriod Period { get; }
+        bool IsAllDayEvent { get; }
+        bool IsMultiDayEvent { get; }
     }
 }