Indeed, SharePoint used to have issues while loading scripts dynamically upon Ajax request.
However this was fixed within the Microsoft Office 2010 October cumulative update.
In case you haven't applied this update, I am suggesting you register the RadScheduler scripts from code-behind at CreateChildControls event of the WebPart:
[ToolboxItemAttribute(false)]
public class Test2RS : WebPart
{
// Visual Studio might automatically update this path when you change the Visual Web Part project item.
private const string _ascxPath = @"~/_CONTROLTEMPLATES/TabStripGrid/Test2/Test2UserControl.ascx";
protected override void CreateChildControls()
{
Control control = Page.LoadControl(_ascxPath);
Controls.Add(control);
RegisterScripts();
}
protected virtual void RegisterScripts()
{
string assemblyFullName = System.Reflection.Assembly.GetAssembly(typeof(RadScheduler)).FullName;
ScriptManager scriptManager = ScriptManager.GetCurrent(Page);
if (scriptManager != null)
{
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Common.Core.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Common.jQuery.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Common.jQueryPlugins.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Common.Popup.PopupScripts.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Common.Navigation.NavigationScripts.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Common.TouchScrollExtender.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.ClientRendering.ClientRendering.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.ClientRendering.BlockCollection.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.ClientRendering.HorizontalBlockCollection.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.ClientRendering.RenderingManager.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.ClientRendering.ResourceStyleMapping.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.ClientRendering.ResourceStyleMappingCollection.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Menu.RadMenuScripts.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Menu.ContextMenu.RadContextMenuScripts.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Input.TextBox.RadInputScript.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Input.DateInput.RadDateInputScript.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Input.InputManager.RadInputManagerScript.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Input.MaskedTextBox.RadMaskedInputScript.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Input.NumericTextBox.RadNumericInputScript.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Calendar.RadTimeViewScripts.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Calendar.RadCalendarCommonScript.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Calendar.RadCalendarScript.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Calendar.RadPickersPopupDirectionEnumeration.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Calendar.RadDatePicker.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Calendar.RadDateTimePickerScript.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Calendar.RadTimeViewScripts.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.ComboBox.RadComboBoxScripts.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.Helpers.DateTime.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.RadSchedulerScripts.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.RecurrenceEditor.RecurrenceEditor.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.ContextMenu.Plugin.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.Views.Week.Model.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.Views.Week.GroupedByResource.Model.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.Views.Week.GroupedByDate.Model.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.Views.MultiDay.Model.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.Views.MultiDay.GroupedByResource.Model.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.Views.MultiDay.GroupedByResource.Model.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.Views.Day.Model.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.Views.Day.GroupedByResource.Model.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.Views.Month.Model.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.Views.Month.GroupedByResource.Model.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.Views.Month.GroupedByDate.Model.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.Views.Timeline.Model.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.Views.Timeline.GroupedByResource.Model.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.Views.Timeline.GroupedByDate.Model.js" });
scriptManager.Scripts.Add(new ScriptReference() { Assembly = assemblyFullName, Name = "Telerik.Web.UI.Scheduler.Scheduling.AdvancedTemplate.js" });
}
}
}
The attached sample is based on the project that you have sent within a support ticket.