[Solved] Get al child rows by parent in hirearchical grid.

[Rajeev]

We have a hierarchical grid and also have a custom toolbar button. On toolbar button click, I have saved Parent and child rows in database. I want to validate client side, all parent and child rows before save. I am able to get all parent rows but I did not found any way to get child row for that parent row. 
Any one have Idea about it. This is the code to get all parent rows.

var grid = $("#ParentGrid").data("tGrid");
var rows = grid.$rows();
for (var i = 0; i < rows.length; i++)
{
var row = rows[i];
// Here I want to get all child rows by parent row
}

Thanks in Advance.
RK