Hello jcaudana,

Thank you for posting on Infragistics forum.

One possible approach to achieve the described by you functionality is to enable “Activation” and/or “Selection” for the grid –

http://help.infragistics.com/Help/NetAdvantage/ASPNET/2010.3/CLR4.0/html/WebHierarchicalDataGrid_Activation.html  

http://help.infragistics.com/Help/NetAdvantage/ASPNET/2010.3/CLR4.0/html/WebHierarchicalDataGrid_Enabling_Selection.html  

When “Selection” for the grid is enabled the clicking of TextBox will lead to selection of the underlying cell. Then you can take the data entered in the TextBox on Client-Side like this:

var WHDG = $find("WebHierarchicalDataGrid1");

var gridView = WHDG.get_gridView();

var selection = gridView.get_behaviors().get_selection();

var selectedCells = selection.get_selectedCellsResolved();

var cell = selectedCells[0];

var textBox = cell.get_element().children[0];

…

This code will return the actual TextBox as HTML element and you can then take the text entered in it.

If you know where the second TextBox is located (band, row, cell, etc.) you can access it by indexes like shown in the following article - http://help.infragistics.com/Help/NetAdvantage/ASPNET/2010.3/CLR4.0/html/WebHierarchicalDataGrid_Access_and_Edit_a_Cell.html

Note that TextBox should be rendered in the page otherwise it will be inaccessible.

Let me know if you have additional questions.