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Open the Java perspective and make sure there are no open editors. Hit Ctrl-Shift-T. The java open type dialog appears. Open the C++ perspective and make sure there are no open editors. Hit Ctrl-Shift-T... nothing. It seems that the C++ Open Element dialog will only appear if there is a C file in an open editor. If there are no open editors or only non-c files open then the hotkey doesn't work.
There is nothing we can do about it. The global kbd-shortcut Ctrl-Shift-T is taken by JDT. You can change that in the preferences.