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CheckComboBox 触发改变事件,返回数据一直为空 #1636

@hua11018818

Description

@hua11018818

Describe the bug

通过ListBoxAttach.SelectedItems绑定后,触发选中事件后,赋值一直是 null
微信截图_20240822193920
微信截图_20240822193619
微信图片_20240822194752
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

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