A docking control similar to what is available in UI for Silverlight.

Provide a tabstrip control that allows users to display content on tabs.

 - Tab content could use virtualization to avoid extra rendering
 - Follow themes from Telerik
 

Universal combo box.

Add a setter for the AutoCompleteBox's SelectedItem property.

Provide component capable of visualize word,excel files with the option to position custom layers (annotations) on top of it.

InputScope in AutoCompleteBox like in TextBox to show only selected kind of keybord when using on touch screen devices.

When the DataGrid is grouped, show the column headers in the group header and allow for aggregates like Sum

There is no way to change the selected filter operator in the Grid Filter UI. Please extend the API to allow this.

Provide API or another approach to achieve synchronized trackballs.

If AllowFocusWhenDisabled is set to true the control should be edited through the keyboard.

Enable drag and drop between cells of different rows in the DataGrid for UWP. Or a way we can develop it ourselfs.

Expose API to limit swiping in a single direction. This should disallow the user to even start swiping in one direction, keeping the functionality intact for the other.

Implement a feature which will allow users to change the trigger which updates the source in Editing Mode

Enabled the control to load its ExpandableContent using the x:DeferLoadStrategy="Lazy" attribute.