我尝试了类似的设置，该设置可以按预期工作:

I tried a similar setup which works as expected:

$("button").click(function() {
  var parent = $("#parent-grid").data("kendoGrid");
  var child = $("#child-grid").data("kendoGrid");

  var selectedDataItem = parent.dataItem(parent.select());

  if (selectedDataItem) {
    child.dataSource.add({
      foo: selectedDataItem.foo
    });
  }
});

这是一个实时演示: http://jsbin.com/EpeMiwe/1/edit