Implement the "add file to existing archive" functionality

When certain files are added to ZipPackage IndexOutOfRangeException is thrown.

http://www.telerik.com/community/forums/silverlight/general-discussions/feature-request-callout-control.aspx

Ability to zip files bigger than 4 GB needed

Add functionality for the ZipPackage to span across multiple files.
This item is migrated to the Telerik Document Processing portal: 
http://feedback.telerik.com/Project/184/Feedback/Details/190122 
Please use the new item for commenting, voting and subscribing instead of this one.

Add a possibility to create a ZipPackage with a password associated with it.

Automatic or easy to configure support for displaying the UAC shield icon when the command that will be executed by the Button or the Menu item will require elevated permissions.

Introduce control similar to TextBox which offers integrated spell-checking (similar to the one provided in RadRichTextBox).

File explorer with the drag and drop upload and just a richer interface

The control should be more customized than normal status bar control for WPF.

The XAML team has recently reviewed this issue and will not be addressing it as with Q1 2014 we introduced theme support for the System.Windows.StatusBar component. This means that you can use the native component within a Telerik powered application and at the same time have a seamless look and feel.  

You can check our Theming SDK demo under MSControls by downloading our SDK browser for WPF on the following page: http://demos.telerik.com/xaml-sdkbrowser/

If you want to share additional requirements about this control please contact us through the support ticketing system with details and a reference to this item.

Coming from RadControls for WinForms I did miss this control.
It didn't take me long to create my own alert controls, but it would be nicer to have them styled and behave like all other telerik controls.

Add: ListView Control

A control that allows you to generate complex layouts.

Available since R3 2016 Official Release.

Add a new Captcha control

Something like an image Viewer for WPF with some kind of animation, not too fancy though.

It would be very helpful if you can plan to create kind of a "drawing tool" to design specific views for flows, state models, workflows, etc.

A new Tag Cloud control similar to the WinForms and ASP.NET Ajax counterparts (http://demos.telerik.com/aspnet-ajax/tagcloud/examples/overview/defaultcs.aspx)

New control request: FishEye menu.