The stack container is a container widget, which puts its child widgets on top of each other and only the topmost widget is visible.

• Two size hint modes.
  • dynamic:true: The stack's size is the preferred size of the visible widget
  • dynamic:true: The stack's size height is the to the height of the tallest widget and the stack's width is set to the width of the widest widget

The stack is used if exactly one out of a collection of many widgets should be visible. This is used e.g. in the tab view widget. Which widget is visible can be controlled by using the selected property.

Here are some links that demonstrate the usage of the widget:

• Two stack container. The first not dynamic, the second dynamic.

Here is a link to the API of the Widget:
qx.ui.container.Stack