The new WPF XAML Designer includes a Suggested Actions menu that is similar to the Smart Tags. The controls from the Telerik.Windows.Controls assembly support these actions for .NET Core projects.
To use Suggested Actions, you need to have Visual Studio Preview 16.10 or later installed.
Suggested Actions give you access to common properties of a control selected within the new WPF XAML Designer. To use this feature, first enable it through Tools > Options > Preview Features > XAML Suggested Actions. Once enabled, click on a supported control and use the lightbulb to expand and interact with the Suggested Actions UI.
Figure 1: Suggested actions menu displayed on RadCallout control