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color of treeGrid column line

How do I change the color of the treeGrid column line ?

You can change column color whith setColumnColor(clr) method where clr - comma delimited colors list:
 mygrid.setColumnColor("white,#d5f1ff,#d5f1ff");
You can change background-color of the necessary row via XML or with API:
<row bgColor="red" class="classForTherRow" style="background-color: red">....</row>
<cell class="cellClass" style="background-color: red">...</cell>

setRowColor(row_id, color) - sets background color of row (via bgcolor attribute):
 mygrid.setRowColor("row1","red");

setRowTextStyle(row_id, styleString) - sets style to row: 
 grid.setRowTextStyle("r123", "background-color: red; font-family: arial;");