I finally found the way to get QAxWidget into the designer.
In case anybody else is interested I post the solution here.
Open the file plugins.pro in the QTDIR\tools\designer\src\plugins folder.
And replace
win32:!contains(QT_EDITION, OpenSource):SUBDIRS += activeqt
win32:!contains(QT_EDITION, OpenSource):SUBDIRS += activeqt
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with
win32: SUBDIRS += activeqt
win32: SUBDIRS += activeqt
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This seems to be fixed in the git sources ( see: http://qt.gitorious.org/qt/qaxwidget-opensource-fix) but is not yet included in the distributed versions.
regards
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