QTreeView repaint

[graeme]

I have also tried the following:

bool RootModel::setData ( const QModelIndex & index, const QVariant & value, int role)
{
	if (!index.isValid())
		return false;
 
	if (role != Qt::EditRole)
		return false;
 
	RootItem *item = getRootItem(index);
	item->setData(index.column(),value);
	emit dataChanged(index, index);
	return true;
}

bool RootModel::setData ( const QModelIndex & index, const QVariant & value, int role)
{
	if (!index.isValid())
		return false;

	if (role != Qt::EditRole)
		return false;

	RootItem *item = getRootItem(index);
	item->setData(index.column(),value);
	emit dataChanged(index, index);
	return true;
}

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Where item->setData() changes the value held in the item. Again if I click on an item it will reflect the change (on on another window) but not otherwise.