How to implement select all checkbox header for cell table

So I followed the code given in these threads : 

https://groups.google.com/forum/#!searchin/google-web-toolkit/select$20all$20in$20celltable$20header/google-web-toolkit/IY8rfYOzRl0/guGZBgcZ9Z8J

http://pgt.de/2012/05/09/checkbox-in-cell-table-data-grid-header/

Apparently when I implemented this, it selects the header checkbox and thereby selects all records for every page. 

Here is my requirement :

I have two column cell table. 

First Column : Checkbox for row selection

Second Column : Employee Name

The idea here is for each classroom, the user can go and select certain employees from list of all employees in cell table and save to DB. If the user comes back to the same classroom, the cell table should show all total employee records with the previously selected employees should have their corresponding row checkbox checked. The user can thereby update the selection by checking and unchecking employees and save again. 

This works fine but since we have paging mechanism in cell table I want to implement "Select All" checkbox on header above the First Column and when that is checked, the corresponding row for that page should all be selected. Then if the user paginates to next page, the "Select All" checkbox on header above the First Column for next page should be uncheck now and that next page should show list of employees with corresponding row checkbox checked (previously checked from DB) if any. The user can check that "Select All" checkbox on header to select all the corresponding row for that page and so on. 

The few important things here is, 

1) I do want to show previously checked employees from the DB in the list of total all employees.

2)  "Select All" checkbox on header should be uncheck every time user comes to this screen. 

3) When the user clicks  "Select All" checkbox on header, then only it should select all the rows "for that page only" and not all the records across all the pages. 

3) Clicking next page should show what I described in point 1 and 2 above. 

Any help would be appreciated. 

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