lib/Ext/form/Panel.js
function() {
        var fields = this.getFieldsArray(),
            ln = fields.length,
            field, i;

        for (i = 0; i < ln; i++) {
            field = fields[i];
            if (field.isFocused) {
                return field;
            }
        }

        return null;
    }
function() {
        var fields = this.getFieldsArray(),
            ln = fields.length,
            field, i;

        for (i = 0; i < ln; i++) {
            field = fields[i];
            if (field.isFocused) {
                return field;
            }
        }

        return null;
    }
Returns the currently focused field
@return {Ext.field.Field} The currently focused field, if one is focused or `null`.
@private