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Retrieve the cell value of the children node

I have a grid which has the levels like that
c0 c1 c2 c3
App Manager 2 2 2 2 2
Group Name 2 2 2 2 2
Resource Type 2 2 2 2
Resource Name A 1 1 1 1
Resource Name B 1 1 1 1

when i update any cell value on Resource Name A or B, the upper levels values should be updated automitically.Please provide the sample code to acheive this. For example if i change C0 value as 0.5 for resource Name A, the resource Type value should be changed to 1.5 , also Group Name and app Manager.

Please help me on this.

There are two ways

a)  It possible to define custom onEditCell event and attach code which will update parent items value when child item changed
b) You can use in-grid math
    http://dhtmlx.com/docs/products/dhtmlxTreeGrid/samples/grid_operations/treeGrid_math.html?un=1216804131000
By using =sum in column definition you enable auto sum for column ( beware that you will need to have <cell type="ed">1</cell> for elements in such column, which still may be editable )