选择第一项，然后点击添加。

Make sure the first option is selected and then click on Add.

youdao

然后基于价值选择第一项设置第二个选择项的默认值。

And then based on the value selected in first item set the default value for the second selected item.

youdao

我怎样才能做一个WPF快捷菜单自动选择第一项的时候开的呢？

How can I make a WPF ContextMenu automatically select the first item when it's opened?

youdao