[paragui-dev] Misc. fixes

[Martin Bickel]

Hi,

here is another patch fixing some problems:
* The Tooltip-Ticker was not initialized
* The latest changes of PG_TimerObject rendered it unusable:
objSingleTimer was set and immediately reset by StopTimer. I've changed
their order .
* Radiobuttons had to be Grouped on construction. If they were grouped
later and all Radiobuttons were pressed (which is the default after
construction), they could not be used because a click on any
RadioButton was ignored since it was already pressed. I've moved the
check for ignoring clicks after the group check.

Martin

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