WPF 组合框和菜单在后台打开
在我的一个项目中，我面临一个问题，组合框下拉菜单和上下文菜单有时不可见。我所说的有时，是指在大约 80% 的情况下它们可以正常打开，但相同的屏幕、相同的代码在 20% 的情况下会神秘地出现此问题。
当我观察其中一个 ModalPopup 窗口时，似乎菜单在弹出窗口下方打开。我想到的最明显的问题是 z-index。但如果这确实是问题所在，那么这种情况不是总是会发生吗？
这是 WPF 的已知问题吗？有解决办法吗？
In one of my projects, I am facing an issue where the combo box drop menu and the context menus are sometimes not visible. By sometimes, I mean that they open up fine in about 80% of the cases, but the same screen, with the same code will have this problem mysteriously 20% of the times.
When I observed one of the ModalPopup windows, it seems like the menus open beneath the popup window. The obvious question that came to my mind was z-index. But if that really was the issue, wouldn't this happen always?
Is this a known issue with WPF? Is there a solution?
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有几个与此相关的问题：
WPF4 bug 报告：
http://connect.microsoft.com/VisualStudio/feedback/details/465964/wpf-combobox-dropdown-list-appears-behind-the-form-when-allowstransparency-true
可能修补程序：
http://support.microsoft.com/kb/943326
There have been a couple issues related to this:
WPF4 bug report:
http://connect.microsoft.com/VisualStudio/feedback/details/465964/wpf-combobox-dropdown-list-appears-behind-the-form-when-allowstransparency-true
Possible hotfix:
http://support.microsoft.com/kb/943326