Calendar2 closes after selecting the first part.

Hello,

the calendar2, which supports relative dates and is used in the adhoc views closes automatically after every selection, so for select a relative timestamp I have to open the Widget 3 times 

1. Select Time Period -> automatically closed
2. Select Adjustment -> automatically closed
3. Select Number-> automatically closed

Same for fixed timestamps: 

1. Select date -> automatically closed
2. Select hour -> automatically closed

Opening the date widget becomes annoying after some time.

Is there any known workaround?

Best regards