How to close a calendar control when a date has been selected?

I have downloaded and installed a calendar control form for excel 2010.
Everything has been working fine but some times when other people use the form they select the wrong dates when trying to enter other data.

I'm trying to work out how to close / hide the calendar when a date has been clicked/selected.

Any help would be greatly appreciated.

The code I have used so far is;

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