QComboBox not showing all items

[musikit]

void MyObj::FillComboBox(const std::vector<std::string> &items)
{
     for(size_t i = 0 ; i < items.size() ; i++)
     {
         cmbItems->addItem(QString::fromUtf8(items[i].c_str()));
     }
 
     fprintf(stdout, "items count %d\n", items.size());
     fprintf(stdout, "cmb item count %d\n", cmbItems->count());
}

void MyObj::FillComboBox(const std::vector<std::string> &items)
{
     for(size_t i = 0 ; i < items.size() ; i++)
     {
         cmbItems->addItem(QString::fromUtf8(items[i].c_str()));
     }

     fprintf(stdout, "items count %d\n", items.size());
     fprintf(stdout, "cmb item count %d\n", cmbItems->count());
}

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------------------------------------------
item count 829
cmb item count 829

again the actual UI displays A-P and then stops.