QSortFilterProxyModel search and view scroll help

[waynew]

I have a QSqlTableModel and a QTableView. Trying to sort through the model, find a record, then scroll to it in the view.
Here is the code, where strID is a string to search for, like "89".

QSortFilterProxyModel proxy;
proxy.setSourceModel(model);
QModelIndex vidx;
 
proxy.setFilterKeyColumn(0);
proxy.setFilterFixedString(strID);
vidx = proxy.mapToSource(proxy.index(0, 0));
 
if (vidx.isValid())
{
	view->selectionModel()->select(vidx, QItemSelectionModel::Select | QItemSelectionModel::Rows);
	view->scrollTo(vidx, QAbstractItemView::EnsureVisible);
}

QSortFilterProxyModel proxy;
proxy.setSourceModel(model);
QModelIndex vidx;

proxy.setFilterKeyColumn(0);
proxy.setFilterFixedString(strID);
vidx = proxy.mapToSource(proxy.index(0, 0));

if (vidx.isValid())
{
	view->selectionModel()->select(vidx, QItemSelectionModel::Select | QItemSelectionModel::Rows);
	view->scrollTo(vidx, QAbstractItemView::EnsureVisible);
}

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I am having two problems.

1. If the header sort is set to column 0 ascending, and the record found has a sequential value in column 0 of more than 256, the scrollTo does not work, 256 or less and it works fine.

2. if the header sort is set to column 0 descending, and the record found has a sequential value in column 0 of 89 for example, the view scrolls to the record with 289 in column 0.

Any advice as to how to overcome these problems greatly appreciated.