code: public void setSelectedColumn(java.lang.Object _selectedColumn) {
  		getStateHelper().put(PropertyKeys.selectedColumn, _selectedColumn);
  	}
docs: Optional parameter defining which columns are selected when the datatable is initially rendered. If this attribute is an integer, it's the column index. If it's a string, it's a jQuery expression. Automatically sets selection='true' and selected-items='column'. <P>
  Usually this method is called internally by the JSF engine.