In a scenario with multiple GroupDescriptors (3,4,5 or more) - data operations like sorting a group, sorting a column or filtering can be slower when the RadGridView is populated with a large amount of data. 

UnverifiedXamlException is thrown when importing an XAML document that contains a DocumentPartProperties instance.

Introduce a way to set the modifier key used for multi-column sorting.

FileDialogs are constructed by RadWindow and ExplorerControl as its content. 

Explorer control holds navigation tree, autocomplete, filtering combobox, main pane for viewing fodler and files, search box, breadcrumb. You can check all visual parts in the following help article:

http://docs.telerik.com/devtools/wpf/controls/radfiledialogs/visual-structure

Users might need to put the ExplorerControl in non-window parts of their application (for example in docked RadPane of RadDocking. Also, they might need to override OK/Cancel commands for that purpose.

Add an event that indicates when a hyperlink is clicked.

Add the full .NET Framework packages (like Telerik.UI.for.Wpf.45.Xaml) in the Telerik online feed (https://nuget.telerik.com/v3/index.json).

Currently, the RadMultiColumnComboBox control does not support the ValidationErrorTemplateHelper.DisplayMode attached property. We could add support for it.

We could add an option to group the dates in the FilteringControl similar to how Excel groups them.

When using Search as You Type behavior, the items will be first filtered using the keywords typed in the TextBox. We can create a way to disable this filtering.

Please add an option to modify the corner radius for TrackBackground and UncheckedTrackBackground in the RadToggleSwitchButton template.

The radius of both rectangles is hard-coded to 9 (TrackBackground)  / 12 (UncheckedTrackbackground) (Why are they different btw?). While it is possible to set the TrackHeight and TrackWidth to custom values, this doesn't really work well for the Fluent theme right now due to the radii quickly becoming disproportionally large or small compared to the TrackHeight. This results in the control losing its shape and becoming more and more egg-shaped or rectangular, depending on whether you decrease or increase the TrackHeight.

Ideally, the Radii would be automatically computed, depending on the selected TrackHeight (Floor(TrackHeight/2) ?), however, a manual solution would also be a lot better than nothing. That way we could at lease define proportionally matching values via styles.

 Form XObject that contains path with a Matrix position is not rendered.

Currently the CurrentTimeIndicator is shown under the appointments when its position is set to WholeArea. Add an option to change this and display the indicator on top of the appointments.

Make the MoveSelectionCommandParameter class public so one can easily access its parameters. 

Currently the Caret of the SyntaxEditor does not behave like Caret in MS TextBox/ RichTextBox when IME is opened - IME opens on the bottom right part of the screen instead of below the caret. Also some input issues when selection is done in the IME should be addressed for a full support of this feature.

Currently, you can navigate through the items in the distinct values list using the arrow keys. This changes the focused item. If you want to check/uncheck the currently focused item you need to press Tab in order to move the focus from the content presenter of the ListBoxItem to the CheckBox control.

Allow check/uncheck of the currently focused item using the keyboard (by pressing the Enter or Space key).

Add keyboard support for the filtering, grouping and sorting features of RadGridView. The keyboard action should start the corresponding action for the column of the current cell. Keyboard actions should be included also for navigation in the UI of the FilteringControl after it gets opened.

Allow setting the group header rows height with a property similar to the RowHeight property of RadGridView. For example, a new GroupHeaderRowHeight property can be introduced. The new property should be included also in the UI virtualization calculations. 

Provide API that allows setting the width of the caret.

The new API should allow you get an SVG file and convert it in a WPF-friendly format.

If there is a control, it should also display the SVG contents.

The drag-and-drop logic currently expects the different RadDocking instances to be hosted in one Window element, more specifically, in the MainWindow of the application.

We could add support for different instances being hosted in separate Window elements that will support dragging and dropping operations.