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MatrixLayout Properties 
· stretchedHorizontally
Specifies whether UI elements aligned using this layout are adapted horizontally to the container size, so that the container is completely filled horizontally.
Switch this option off, if the width of the container is to be determined by the content.
· stretchedVertically
Specifies whether UI elements aligned using this layout are adapted vertically to the container size, so that the container is completely filled vertically.
Switch this option off, if the height of the container is to be determined by the content.