CheckComboBox 触发改变事件，返回数据一直为空
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hua11018818 commented
Describe the bug
通过ListBoxAttach.SelectedItems绑定后，触发选中事件后，赋值一直是 null
并且如果是绑定的List，通过ListBoxAttach.SelectedItems绑定也没有选中
Steps to reproduce the bug
1，ItemsSource 绑定List或者List
2，ListBoxAttach.SelectedItems 设置的值始终为null，T类型时候没有初始化选中
Expected behavior
No response
Screenshots
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NuGet package version
None
IDE
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Framework type
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Windows version
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Additional context
No response