Accessing Cell's Content from a Layout

I have a window, within this window I have a Layoutpanel (2E), in the upper Cell there is a form and in the lower cell theere is a Grid:

…Cell A
…Cell B

If the user hits the save button, I want to update the grid in cell B.
How do I access this Grid? How do I access the inner content of the cell?

Thank you very much!

You may try to update the data of your grid using updateFromXML() method: … atefromxml