Dynamic adding childs to a treestore

[Kees Kling <ckling upcmail nl>]

Hi

I'm trying to build a Gtk::TreeStore object dynamically which is filled 
with records from a mysql table


code I'm using to build the TreeStore:

+++++
for ( vector<mysqlpp::Row>::iterator it = result.begin(); it != 
result.end(); ++it) {
        const Gtk::TreeModel::Row* runchild = 
source->appendRow((string)it->at(0),it->at(1),NULL);
        // getting unique runtimes of the model
        query = dbaseConnection->query();
        query<<"select distinct basetime from modeldata where MID = 
"<<it->at(1);
        vector<mysqlpp::Row>runtime;
        query.storein(runtime);
        for (vector<mysqlpp::Row>::iterator itr = runtime.begin(); itr 
!= runtime.end(); ++itr) {
            const Gtk::TreeModel::Row* fcchild = 
source->appendRow((string)itr->at(0), 0,
                runchild );
        }
    }
+++++
In this part I'm calling the method appendRow, which is a method of my 
TreeView object

+++++++++++++++++
const Gtk::TreeModel::Row* sourceViewer::appendRow(string name, int id,
        const Gtk::TreeModel::Row* parent ) {
    const Gtk::TreeModel::Row* row;
    if ( parent == NULL ) {
        //Creates a new row at the end of the top-level.
        row  = &(*(sourceTreeStore->append()));
    } else {
        //Creates a child list
        row  = &(*(sourceTreeStore->append(parent->children())));
    }
    row->set_value(sourceColumns.name,name);
    row->set_value(sourceColumns.id,id);
    return row;
}
++++++++++++++++++++


As long as my third parameter = NULL, thus not creating a child 
everything is OK, but when adding a child I get a crash and the nect error

gtkmm:ERROR:treeiter.cc:214:const Gtk::TreeNodeChildren& 
Gtk::TreeRow::children() const: assertion failed: (!is_end_)

What is wrong here?????

Thanks