English to Chinese Tech/Engineering Computers: Software other

definition:
a window that is subsidiary to the main document window. It has a special small title bar and it floats above standard windows even when it is not the current focus. A floating palette is typically used for options and controls.

应该译为浮动选项板还是下拉菜单，那个更好？二者可以互相替换吗？
Thanks in advance！