Properties

When you select a control on the canvas, the Properties group will show you the common properties that you will need in order to start customizing it. If we take our rectangle as an example, the properties display will relate to the fill color, border, and positioning. If we were to compare this to a label control, we would also see text color as a property:

Properties, however, don't need to be static. They can have Rules associated with them so that they're more dynamic.