The Squash widgets are used to control the layout. A HSquash widget
makes its child widget nonstretchable in the horizontal dimension.
A VSquash operates vertically, a HVSquash in both
dimensions. You can used this for example to reverse the effect of
`Left making a widget stretchable. If you want to make a VBox
containing for left aligned CheckBoxes, but want the VBox itself to be
nonstretchable and centered, than you enclose each CheckBox with a
`Left( .. ) and the whole VBox with a HSquash( ... ).
See the Layout HOWTO for details.