I guess you have a Ext.form.Panel within the window then you only need to do the following:
listeners : {
itemdblclick: function(dv, record, item, index, e) {
var win = _restoreCallsWindow(),
field= win.down('textfield'); // assuming you have just one textfield
field.setValue(record.get('path'));
}
}
Please note that the name property of each field must match the property name of the record. Other wise this won't work.