Introduction - If you have any usage issues, please Google them yourself
Treeview hierarchical method of data loading.
This example has four tables, categories, respectively (Table I), in the category table (Table II), subclass (Table III), small classes (Table IV). First define the virtual table (Table V) as follows, order the Tables I, II, III, IV data tables fill each of five tables. Be sorted by number, as Table VI. At this point, then the table data into six Treeview.