Tree size for TreeByNesting UI Element

Hi
I have table and a Tree embedded in it.
I have mapped a value Attribute to the table property  for no of rows to visible.
When the User Expands a Tree node I am trying to use onActionLoad Children to find out no of children and try to set the same to the value Attribute.
But there is no event getting generated when user Collapses the tree Node to determine the size of the Table.
please let me know in case we can achive the same by other means.
Thank you
Regards
Krishna Kanth

hai krishna,
           Say A-parent B-parent
            a1,a2,a3 -- b1,b2,b3 are children
    the children will be available in a table in backend.just loop the table and get the children under parent A and load them under A |||ly do it for parent B.Please give ur requirement in detail.
Regards
Sharanya.R

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