ComboBox default value

[neda]

Hi,
I want to set default value for combobox. But "find" method returns -1.

MyComboBox{
                                        id:cmbZoom
                                        model:XmlListModel {
                                            id: xmlZoomModel
                                            source: "files/zoom.XML"
                                            query: "/tbl_zoomCalib/record"
                                            XmlRole { name: "text"; query: "@zoom/string()" }
                                            XmlRole { name: "value"; query: "@number/string()" }
                                        }
                                        textRole: "text"
                                        onCurrentIndexChanged: {
                                            myXML.newZoom=xmlZoomModel.get(currentIndex).text;                                            
                                        }
                                        Component.onCompleted: {
                                            currentIndex=cmbZoom.find("20");
                                        }
                                    }

MyComboBox{
                                        id:cmbZoom
                                        model:XmlListModel {
                                            id: xmlZoomModel
                                            source: "files/zoom.XML"
                                            query: "/tbl_zoomCalib/record"
                                            XmlRole { name: "text"; query: "@zoom/string()" }
                                            XmlRole { name: "value"; query: "@number/string()" }
                                        }
                                        textRole: "text"
                                        onCurrentIndexChanged: {
                                            myXML.newZoom=xmlZoomModel.get(currentIndex).text;                                            
                                        }
                                        Component.onCompleted: {
                                            currentIndex=cmbZoom.find("20");
                                        }
                                    }

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