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並前往https://bugs.openjdk.java.net/browse/JDK-6203291

[JDK-6203291] JPopupMenu must use window extended style ...

... then the heavyweight component must have the window extended style WS_EX_TOOLWINDOW in order to act as a native popup menu under win32.

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查詢 「WS_EX_TOOLWINDOW」的人也找了：

  1. WS_VISIBLE
    2.
  2. CreateWindowEx
    3.
  3. UpdateLayeredWindow
    4.
  4. SetLayeredWindowAttributes
    5.
  5. ShowWindow
    6.
  6. BS_OWNERDRAW
    7.
  7. Window class name
    8.
  8. CREATESTRUCT
    9.