extjs - Sencha Touch how to set selected item in selectfield -

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I'm using Touch 2.3.1. How to select an item in a selectfield? There is no way to support this. I do not want to set the invoice to a placeholder in select grounds.

I tried it Google but there is nothing about it.

Obviously it supports it.

Value Ext.field.Select's is the value of the selected item, therefore, you can either set the initial value or at any time by value Config from the setValue method.

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