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All widgets in an interface are organised into a tree viewable
directly through the View-->Show
Widget Tree menu of the main window. When a widget on your
canvas is selected the right mouse button menu allows you to view the
path up the tree from this selected widget to the root widget. The
path from the filename label (label1) above consists of
hbox1, vbox1, dock1, and finally
app1. Each of these have submenus from which you can choose
to perform actions on those widgets. For example, if you delete
vbox1 then that widget and all of it's children will be
deleted from the canvas--so be careful!
We can see the Widget Tree window expanded above. Thus,
app1 contains dock1 which is made up of three
sub-components: dockitem1 contains the menu bar;
dockitem2 contains the toolbar; and vbox1 is the
Vertical Box that we added above. The Widget
Tree window provides an alternative mechanism for selecting
widgets.
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