The Navigation Bar is a helpful tool located at the bottom of the Properties Pane. When selecting a Widget in the Design Surface and choosing Properties in the Side Menu or the Ribbon, you will see the Navigation Bar displaying selectable elements as images at the bottom of the dialog bar. These elements displayed are directly related to the Widget selected and you will notice that you can scroll left and right accordingly to navigate through all elements available for modifying. When selecting an element in the Navigation Bar you will also notice the available Properties displayed in the Dialog Bar will be directly related to that element.
Figure 1: The Pivot - Table element is selected in the Navigation Bar, and the corresponding properties are shown in the Properties Pane.