Issue resetting GroupPickerItemsPanel template

[Spencer]

I'm building functionality that allows changing the filter and group picker.  Basically i have a phonebook style and normal default style.  What i'm seeing is once i display the group picker i can no longer change the template used.   Is there a special way you have to reset that?  Here's a sniplet of the code.

                RadJumpList list = null;

                // determine which list to manipulate
                if (args.ViewType == MainViewType.Favorites)
                {
                    list = this.favoriteJumpList;
                }
                else if (args.ViewType == MainViewType.Scenes)
                {
                    list = this.sceneJumpList;
                }
                else if (args.ViewType == MainViewType.Devices)
                {
                    list = this.deviceJumpList;
                }

                // reset the template info
                if (args.ViewType == MainViewType.Favorites)
                    list.GroupPickerItemTap -= FavoriteJumpListGroupPickerItemTap;
                else if (args.ViewType == MainViewType.Scenes)
                    list.GroupPickerItemTap -= SceneJumpListGroupPickerItemTap;
                else if (args.ViewType == MainViewType.Devices)
                    list.GroupPickerItemTap -= DeviceJumpListGroupPickerItemTap;
    
                list.GroupHeaderTemplate = null;
                list.GroupPickerItemsSource = null;
                list.GroupPickerItemTemplate = null;
                list.GroupPickerItemStyle = null;
                list.GroupPickerItemTemplateSelector = null;
                list.GroupPickerItemsPanel = null;
                list.StickyHeaderTemplate = null;
                list.GroupDescriptors.Clear();
                list.SortDescriptors.Clear();

                if (args.GroupByType == MainViewGroupByType.Alphabetical)
                {
                    GenericGroupDescriptor<VeraItem, string> groupBy = new GenericGroupDescriptor<VeraItem, string>(item => Regex.IsMatch(item.Name.Substring(0, 1).ToLower(), "^[a-z]{1}$") ? item.Name.Substring(0, 1).ToLower() : "#");
                    GenericSortDescriptor<VeraItem, string> sortBy = new GenericSortDescriptor<VeraItem, string>(item => item.Name);

                    list.IsStickyHeaderEnabled = true;

                    string alphabet = "#abcdefghijklmnopqrstuvwxyz";
                    List<string> groupPickerItems = new List<string>(32);
                    foreach (char c in alphabet)
                    {
                        groupPickerItems.Add(new string(c, 1));
                    }
                    list.GroupPickerItemsSource = groupPickerItems;
                    list.GroupDescriptors.Add(groupBy);
                    list.SortDescriptors.Add(sortBy);

                    if (args.ViewType == MainViewType.Favorites)
                        list.GroupPickerItemTap += FavoriteJumpListGroupPickerItemTap;
                    else if (args.ViewType == MainViewType.Scenes)
                        list.GroupPickerItemTap += SceneJumpListGroupPickerItemTap;
                    else if (args.ViewType == MainViewType.Devices)
                        list.GroupPickerItemTap += DeviceJumpListGroupPickerItemTap;

                    list.GroupHeaderTemplate = (DataTemplate)this.Resources["AlphabeticGroupHeaderTemplate"];
                    list.GroupPickerItemTemplateSelector = (DataTemplateSelector)this.Resources["PhoneBookStyleGroupPickerItemTemplateSelector"];
                    list.GroupPickerItemsPanel = (ItemsPanelTemplate)this.Resources["PhoneBookStyleGroupPickerItemsPanel"];
                    list.StickyHeaderTemplate = (DataTemplate)this.Resources["AlphabeticStickyHeaderTemplate"];
                }
                else if (args.GroupByType == MainViewGroupByType.Category || args.GroupByType == MainViewGroupByType.Room)
                {
                    if (args.GroupByType == MainViewGroupByType.Category)
                        list.GroupDescriptors.Add(new GenericGroupDescriptor<VeraItem, string>(item => item.Category));
                    else
                        list.GroupDescriptors.Add(new GenericGroupDescriptor<VeraItem, string>(item => item.Room));

                    list.IsStickyHeaderEnabled = true;

                    list.GroupHeaderTemplate = (DataTemplate)this.Resources["GroupTemplate"];
                    list.GroupPickerItemTemplate = (DataTemplate)this.Resources["GroupPickerItemTemplate"];
                    list.GroupPickerItemStyle = (Style)this.Resources["GroupPickerItemStyle"];
                    list.GroupPickerItemsPanel = (ItemsPanelTemplate)this.Resources["NormalGroupPickerItemsPanel"];
                    list.StickyHeaderTemplate = (DataTemplate)this.Resources["GroupTemplate"];
                }

[Kiril Stanoev]

Hi Spencer,

Thank you for contacting us. Unfortunately this scenario is currently not supported and we are not aware of an existing workaround.

The GroupPickerItemTemplate property is set to the ItemsTemplate property of a control named JumpListGroupPicker. JumpListGroupPicker is basically a System.Windows.Controls.ItemsControl. As far as I know, changing the ItemsPanel of a System.Windows.Controls.ItemsControl is not yet available in Windows Phone 7. The same scenario has been working properly in WPF. Some time ago the issue was present in Silverlight as well but Microsoft managed to fix it. The problem is that the fix has not been included in the last Windows Phone release. 

We will be able to achieve this scenario as soon as we manage to integrate our ListBox into the JumpList. Until then, there is not much we can do. Sorry for the inconvenience caused.

Greetings,
Kiril Stanoev
the Telerik team

[Spencer]

Thanks for the reply.

[Derek]

edit: I figured this out.

To make sure I understand:

If I have a jump list of customers, like the phone book example.  It's ItemsSource is bound to a collection of Customers.  On the initial load of Customers I have customer names that start with 'A' and 'B' so the template selector enables 'A' and 'B'.

If I refresh Customers and now have customer names that start with 'A', 'B', and 'C' the template won't update and 'C' will remain disabled?

[Kiril Stanoev]

Hi Derek,

 The scenario you described is supported. What I meant in my previous post was that the ItemsPanel cannot be changed runtime:

The ItemsPanel property gets or sets the template that defines the panel that controls the layout of items. 

As for the DataTemplate of each item, it can be changed runtime using a template selector. Let me know if this answers your question.

Regards,
Kiril Stanoev
the Telerik team