DataGrid component scrollbar

programming flash
1

Trouble with my DataGrid component (aDg), i want to tell it to got a fixed height, and then have a scrollbar when the lines into the Datagrid are biger than its height, but with this code, it doesn’t work, the grid continues to get bigger without scrollbar :


    myDP= new DataProvider(fileXML); 
    aDg.dataProvider = myDP;  
    aDg.columns = [nameCol, numCol, prixCol];
    aDg.verticalScrollPolicy = ScrollPolicy.ON;
    aDg.width = 300; 
    aDg.height = 40; 
    aDg.rowCount = aDg.length;

note that this code works well if I wanted Horizontal scroll bar by replacing
aDg.verticalScrollPolicy = ScrollPolicy.ON;
by
aDg.vhorizontalScrollPolicy = ScrollPolicy.ON;