Classes
 ClassDescription
 Box A Box container lays out its children in a single vertical column or a single horizontal row.
 BoxDirection The BoxDirection class specifies constant values for the direction property of the Box container.
 Canvas A Canvas layout container defines a rectangular region in which you place child containers and controls.
 HBox The HBox container lays out its children in a single horizontal row.
 VBox The VBox container lays out its children in a single vertical column.
 ViewStack A ViewStack navigator container consists of a collection of view containers stacked on top of each other, where only one view at a time is visible.