You can create a browsing TreeView control: the TreeView control will be linked to a data file or to a query.
The programming of the TreeView controls is simplified: there is no need to use the TreeXXX functions directly.
Creating a browsing Treeview control
"Delayed fill of sub-levels" option
The "Delayed fill of sub-levels" option allows you to fill each sub-level when the user clicks to expand a level. In this case, the filling time is spread out and the initial fill is much faster.
Note: To use this option on a TreeView control filled by programming, call ..添加子元素.
Browsing TreeView control
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All you have to do is configure your product as follows: