static/ext/src/ux/form/ItemSelector.js
function() {
        var me = this; 
        me.mixins.field.setValue.call(me, me.setupValue(me.toField.store.getRange()));
    }
function() {
        var me = this; 
        me.mixins.field.setValue.call(me, me.setupValue(me.toField.store.getRange()));
    }
Synchronizes the submit value with the current state of the toStore