Accepting keyboard input after focus() on spinner

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Accepting keyboard input after focus() on spinner

I have a qx.ui.form.Spinner() widget

var price = new qx.ui.form.Spinner(0, 0, 100);

the spinner widget get focus (highlighted border). But i wont be able to change the value
without clicking inside the spinner widget.

I want to be able to 
1.automatically focus in the widget and if 
2.user press any numeric key, it will clear the spinner value first then the value will be appear in the spinner widget.

How to do this?

Thank you.

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