go to last line of listview - bb10 cascades

gistfile1.txt

how do i obtain the number of elements from dataModel?
 
It depends on dataModel type which you are using, consult the docs of corresponding classes.

For ArrayDataModel and GroupDataModel:
var n = dataModel.size()      // or dataModel.childCount(0) - number of children in first section
 
indexPath is an array where the first number is section and the second one is row in section.
 
Something like this should work:
 
var dataModelSize = listViewId.dataModel.size(); // or listViewId.dataModel.childCount(0)
if (dataModelSize > 0)
{
  var lastRowNumber = dataModelSize - 1
  listViewId.scrollToItem([0, lastRowNumber], ScrollAnimation.Default);
}

Replace the listViewId with id of your ListView.
 
If this won't work, please paste your current code and the errors which appear in logs (if any).