In QML Combobox does not expand on click

In QML Combobox does not expand on click.

Reproduction:
1. Create Qt Quick 2 Application
2. include QtQuick.Controls 1.0
Add in qml:

    ComboBox {
        anchors.centerIn: parent
        model: 5
    }

3. Click on Combobox

Application Output:

I/Choreographer(17189): Skipped 57 frames! The application may be doing too much work on its main thread.