Data Grid Selection problem

Hi All,
When I use Action Script to create DataGrid, the selection
line cannot be changed in mouse click event. But the
dg.selectedIndex has be changed correct row, only the selection
line is no change.
My sample code as follow:
var dg:DataGrid = new DataGrid()
dg.selectable = true;
var cols:Array = new Array();
var col1:DataGridColumn = new DataGridColumn();
col1.dataField = "col1";
var col2:DataGridColumn = new DataGridColumn();
col2.dataField = "col2";
cols.push(col1);
cols.push(col2);
dg.columns = cols;
var row1:Object = new Object();
var row2:Object = new Object();
var row3:Object = new Object();
var row4:Object = new Object();
var rows:Array = new Array();
rows.push(row1);
rows.push(row2);
rows.push(row3);
rows.push(row4);
dg.dataProvider = rows;
The selection line always hold on last row, how to solve it
let the selection line can follow the selectedIndex to change?
Thanks

The function code is: &F03
alternativley I already tried BACK with the same result.
Where shall I put the LEAVE TO SCREEN 0 when it's using the standard PAI Module which is NOT included within my Report?

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