addRowBefore

adds new row to treeGrid, before 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]

Available only in PRO Edition

Example

myTreeGrid.addRowBefore("new_id",["col1_value","col2_value","col3_value"],"row_id",
"folder.img",true);

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