是否每个窗体都有默认按钮?

Is there a default button specified on the screen?

每个窗体应有一个默认按钮。任何情况下点击回车都可以激活默认按钮。

If there is a Cancel button on the screen, then pressing should activate it.

修正了一个选项菜单中的问题，现在默认按钮也会对杂项区的值生效。

Fixed a problem with the Options Menu such that the Defaults button now works for the values of the Miscellaneous Section as well.