Stack Groups are arranged one below the other or side-by-side depending on the WidgetView.Orientation property value. In the image below, the Widget View is oriented Vertically and contains 3 Stack Groups, each arranging its Documents in a single column.

Stack Groups can either occupy the predefined length, or dynamically resize to the available space. This behavior depends on the Length property.
You can modify a Group's settings via the Properties property. Alternatively, use the WidgetView.StackGroupProperties property to specify properties common to all Stack Groups within the View.
See the Widget View topic for details.
System.Object
System.MarshalByRefObject
System.ComponentModel.Component
BaseComponent
BaseRelativeLengthElement
StackGroup