ADF Tree with Boolean Check Box: How to find selected items

Hi Experts,
ADF: 11.1.1.5.0
WLS: 10.3.6
I am using an ADF Tree which contains elements at two levels (say Departments and Employees). My requirement is to give provision for user to select Departments and Employees using the check boxes. User should be able to select what ever Departments he/she likes and what ever employees he/she likes. There should not be a provision to select Employee with out selecting the corresponding Department (root node in the tree).
I am facing the below issues while trying to implement this use case:
1. Always, only the first master record will be expanded by default (I am using "Display Row" property value as "default" and "ExpandAllEnabled" as "true"). My need is to expand all the master records by default. So that user need not explicitly expand each master record node and then select the associated child records.
2. Currently, I am using value change listener associated to af:selectBooleanCheckBox to identify the Departments and Employee records that have been selected. Since not all departments (masters) are expanded by default, if user selects the check box of department (master) and then expands the department node, automatically all the employees of that department are selected. But, this event is not triggering the value change listener for the employee records. Because of this, after a department node is selected and then expanded, all the child elements' check boxes are selected but the events are not generated. Hence, I am not able to capture the selection of employee records.
To summarize,
1. Please let me know how to expand all master nodes in af:Tree by default.
2. Please let me know the best approach to identify the selected items (both master and detail items) in the af:Tree component using af:selectBooleanCheckBox.
Thanks in advance,
Rathnam

Hi,
Can you please elaborate the solution? I have a similar problem in
https://forums.oracle.com/thread/2579664

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