[Behavior] Navigation with arrow keys [Not supported] Not applicable. [Supported] 
Navigation with arrow keys in the WindowsFormsHost control is the same as in an ordinary Windows Forms container control: The UP ARROW and LEFT ARROW keys select the previous control, and the DOWN ARROW and RIGHT ARROW keys select the next control. The UP ARROW and LEFT ARROW keys from the first control that is contained in the WindowsFormsHost control perform the same action as the SHIFT+TAB keyboard shortcut. If there is a focusable WPF control, focus moves outside the WindowsFormsHost control. This behavior differs from the standard ContainerControl behavior in that no wrapping to the last control occurs. If no other focusable WPF control exists, focus returns to the last Windows Forms control in the tab order. The DOWN ARROW and RIGHT ARROW keys from the last control that is contained in the WindowsFormsHost control perform the same action as the TAB key. If there is a focusable WPF control, focus moves outside the WindowsFormsHost control. This behavior differs from the standard ContainerControl behavior in that no wrapping to the first control occurs. If no other focusable WPF control exists, focus returns to the first Windows Forms control in the tab order.