when setting popup placement and using right to left language, the popup is not aligned as expected.

For example placement center, popup displays on right side

placement bottom, popup displays on top

can launch a popup from a button by pressing enter, but can’t exit the popup with just the keyboard. Provide an option to access elements inside the popup content

Currently when the user taps outside the non-modal popup, the popup is dismissed. We'd need to provide a way to set focus to input fields in the page without removing/closing the popup.

Implement an API for scaling the content of the Popup control. When scale is set the position of the control based on its target should not be affected. The HorizontalOffset and VerticalOffset should also be preserved. Also, introduce a scale API for all controls that internally are using Popup - like ComboBox, AutoComplete, Pickers etc.

It would be nice to have more animation styles when the popup opens/closes.  Specifically, it would be nice to have an animation that slides in from a direction (top, bottom, right, left).  I would like to have a popup that appears to slide up from the bottom of the page when it opens and slides down when closing.  I know you can get a similar effect with the SideDrawer control but would prefer to use the popup.

Provide a way to blur the background of the popup, so that the user cannot see through it.