Digging a bit further, it turns out that by design, native context menu is supported only in a small number of controls, mainly the ones where you can copy & paste:
All of these show the native (browser’s) context menu except for the ComboBox. So I can’t reproduce the problem you mention with TextBox.
Please ignore the previous logged issue I referred.
The issue #1595 ComboBox doesn’t show Native context menu was created and is already fixed in our internal build. It will be part of the next public release.
As you can read at TextBox class documentation is
EnableNativeContextMenu – Enables or disables the browser’s context menu.
What your sample shows on Window1 is a Wisej ContextMenu, not a browser context menu.
Nevertheless, there is a problem since your sample show the context menu defined in desktop to “leak” and show in Window1. If you use a Page instead of a Desktop, you can see that the context menu defined in the Page, doesn’t show in Window1.
The issue was logged as WJ-9174.
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