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EVALUATION
The TextField control starts beeping on some keys pressing (enter, up, down...) after switching the EDIT control to RICHEDIT.
The suggested fix disables the beeper before the RICHEDIT control keys processing and turns the beeper to the initial state after that.
changeset: http://hg.openjdk.java.net/jdk7u/jdk7u-dev/jdk/rev/3f44e9547a6b