* @private
* Base class for Box Layout overflow handlers. These specialized classes are invoked when a Box Layout
* (either an HBox or a VBox) has child items that are either too wide (for HBox) or too tall (for VBox)
* @private
* Base class for Box Layout overflow handlers. These specialized classes are invoked when a Box Layout
* (either an HBox or a VBox) has child items that are either too wide (for HBox) or too tall (for VBox)