adds a new row to treeGrid, after some other row
| new_id | string|number | new row id |
| text | array | an array of cell labels in a row |
| sibl_id | string|number | id of row, related to which new one will be added |
| img | string | img url for new row |
| child | boolean | child flag (optional) |
myTreeGrid.addRowAfter("new_id",["col1_value","col2_value","col3_value"],"row_id",
"folder.img",true);
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