Editing mode - To press F1 twice for a 'highlighted' (and valid) method result in no documentation available

While in editing mode, if I click on a method for which I want some documentation (e.g. QWidget::show()), then to press the F1 key once will bring up the help pane to the right of the editor with the right help contents. If I press the F1 key a second time (which in Qt Creator 2.1.0 meant getting the help pane to take the whole space normally occupied by the editor), then the help pane doesn't resize and, instead of the help contents, I get a message that reads:

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show
No documentation available.
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From there, if I click on the "Go to Help Mode" 'button' at the top-left of the help pane, then the help pane 'maximizes' as expected. Then, if I press the ESC key, I get the editor back with the help pane to its right. From there, if I press the F1 key twice, the help pane does, this time round, 'maximize' as expected. So, it's just the first time round and if I don't click on the "Go to Help Mode" 'button' that things won't work.