gets the label of the column specified by index
| cin | number | column index | 
| ind | number | header row index (optional, 0 by default, makes sense only for a multiline header) | 
| string | the label of the column specified by index | 
//get label of the first column
var colLabel=myTreeGrid.getColLabel(0);
//get label of the second line of the first column
var colLabel=myTreeGrid.getColLabel(0,1);
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