remember which calendars were active, and display that. r=shaver

calendar/resources/content/calendarManagement.js

@@ -168,6 +168,7 @@ function setCalendarManagerUI()
         calendarList.removeChild(child);
     }
 
+    var composite = getDisplayComposite();
     var calmgr = getCalendarManager();
     var calendars = calmgr.getCalendars({});
     for each (var calendar in calendars) {
@@ -175,7 +176,9 @@ function setCalendarManagerUI()
 
         var checkCell = document.createElement("listcell");
         checkCell.setAttribute("type", "checkbox");
-        checkCell.setAttribute("checked", true);
+
+        checkCell.setAttribute("checked", 
+                               composite.getCalendar(calendar.uri) ? true : false);
         listItem.appendChild(checkCell);
         listItem.addEventListener("click", onCalendarCheckboxClick, true);
 

calendar/resources/content/calendarUtils.js

@@ -53,11 +53,7 @@ function getDisplayComposite()
     if (!gDisplayComposite) {
        gDisplayComposite = Components.classes["@mozilla.org/calendar/calendar;1?type=composite"]
                                      .createInstance(Components.interfaces.calICompositeCalendar);
-       var calMgr = getCalendarManager();
-       var calList = calMgr.getCalendars({});
-       for (i in calList) {
-           gDisplayComposite.addCalendar(calList[i]);
-       }
+       gDisplayComposite.prefPrefix = 'calendar-main';
     }
     return gDisplayComposite;
 }