We can introduce a provider for the Azure Maps for the RadMap control, which will cover the visualization and services that are already provided by the BingRestMapProvider.

Additionally, we can introduce support for vector tiles in this provider for the Azure Maps.

This is the same feature as the "FilterRow" FilteringMode setting of RadGridView for WPF.

The default behavior of the WinUI native Popup is to render within the bounds of its owner element. This means if the DataGrid reaches the end of the window and there is not enough space for the filtering control to draw, it will get clipped.

To avoid the clipping and allow the Popup to get displayed outside of the window, the ShouldConstrainToRootBounds property of the Popup should be set to false. 

Add an API in the RadDataGrid control to allow setting the ShouldConstrainToRootBounds option of the Popup.

In the meantime, you can disable the Popup constrain via an implicit Style in App.xaml:

<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>                
            <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
            <ResourceDictionary Source="ms-appx:///Telerik.WinUI.Controls/Themes/Generic.xaml"/>
            <!-- Other merged dictionaries here -->
        </ResourceDictionary.MergedDictionaries>
        <Style TargetType="Popup">
            <Setter Property="ShouldConstrainToRootBounds" Value="False" />
        </Style>
        <!-- Other app resources here -->
    </ResourceDictionary>
</Application.Resources>

Create a combo box control that supports multi selecting, like the WPF version e.g.

https://docs.telerik.com/devtools/wpf/controls/radcombobox/features/multiple-selection