I guess I found the answer by myself.
<script>
function init()
{
grid = ColdFusion.Grid.getGridObject("MainGrid");
gb = grid.getColumnModel();
grid.reconfigure(grid.getDataSource(),gb);
grid.addListener("rowdblclick", function(grid, rowIndex, e)
{
var record = grid.getDataSource().getAt(rowIndex); // Get
the Record
var Mykey = record.data.MyKEY;
ColdFusion.Window.create('windiow1','My Window
Title','win_mywindow.cfm?URLkey='+MyKEY,{height:500,width:620,modal:false,closable:true,draggable:true,resizable:false,center:false,initshow:true});
e.stopEvent();
//console.log(record);
});
}
</script>