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inserting the image in to cell

hi
i am using the mygrid.cells(i,j).setImage(url"); i am getting _childIndexes' is null or not an object error is it present in professional edtion becz i am using free version

This functionality available in both standard and professional edition
Mentioned error occurs when you call operation against row which not exists in grid. It may appear if you are using incorrect row ID , or you calling command before row created ( most common case - executing command just after loadXML , when data nor really loaded yet )