Example 4 : setParent
As soon as we create a layout, all new GUI elements will automatically
be added underneath the new layout. Often though we want to
change the default layout underwhich controls get parented.
The following example places 2 frame layouts underneath a columnLayout.
Within each frame layout is a columnLayout which contains some
controls. So, having finished adding controls to frame 1, we
need to set the highest columnLayout as the current parent so
that frame2 will be added underneath that rather than frame1.
to do this, we could either use setParent $ui_name
or we can use setParent .. which takes
us up a single level in the GUI.