类别只提供操作，不提供属性。

A category may only provide operations, not attributes.

youdao

窗口样式或类别属性对此操作无效。

The window style or class attribute is invalid for this operation.

youdao

窗口样式或类别属性对此操作无效。

The window style or class attribute is invalid for this operation.

youdao