The mx.containers.utilityClasses package contains utility classes used by the containers.

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	Interface	Description
	IConstraintLayout	IConstraintLayout is a marker interface that indicates that a container supports ConstraintColumn class and ConstraintRow class within its layout.

	Class	Description
	ConstraintColumn	The ConstraintColumn class partitions an absolutely positioned container in the vertical plane.
	ConstraintRow	ConstraintRow class partitions an absolutely positioned container in the horizontal plane.