Oracle JHeadstart Developer's Guide - Downloads - Oracle

2. Add Data Collections (also known as View Object instances or VO usages) for these
View Objects to the Data Model of the Application Module. Add CountriesView as a
child of RegionsView and LocationsView as a child of CountriesView. You might
need some perseverance here: the user interface of the JDeveloper wizard is not that
user-friendly. When adding a detail view, it is important to select the subview in the
list of Available View Objects. The subviews are indented in the picture above within
the red rectangles. Then select the intended parent Data Collection in the Data
Model, and click the right arrow button. You should end up with something like this:
3. For selecting nodes in the tree, you need an extra Data Collection for each type of
tree node. It is recommended to create dedicated Data Collections for tree selection,
for example RegionsViewTreeSelect, CountriesViewTreeSelect, and
LocationsViewTreeSelect. These usages should be top-level usages in the Data
Model, that is, they should not be a child of another Data Collection.
4. Make sure the JHeadstart Application Definition has groups and detail groups for
your tree. You can maintain your groups by hand, or you run the ‘New Application
5 - 26 Generating Page Layouts JHeadstart Developer’s Guide