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I have a grid with three columns: quantity, price, and total.  quantity and price are simple integer columns, while total is a math cell with [=c0*c1] as the formula.  Total displays the product of quantity and price. 

I then have a footer which displays two totals; one for the quantity total and the other for the sales total.  When the grid initially loads the quantity total displays fine, but the sales total is 0.  Only after I edit a cell does the sales total in the footer display the correct number (because the footer is refreshed on cell edit similar to your sample content).  I believe the problem is that the footer content is refreshed before the third column has a chance to compute the math formula so the footer calculation initially sees all zero values for that column.

I am using the .loadXML() method and the callback feature to initially populate the footer content.  I think that this is a bug and the callback needs to wait until math functions in the grid have all completed rather than executing as soon as the XML is loaded into the grid structure.

If you haven't found the needed information there and still looking for a solution, you will find the additional help checking progress bar jsp and html editable combo box.