DropDownList in a popup window behavior

I have a popup window(calendar control) which contains a drop-down-list with many items in it. The problem occurs when I try to select the year 1930, which is outside of the popup frame:

This close the the entire popup window instead of selecting the year 1930 as expected (well, I did anyway). I tried to cancel the event from bubbling, to set the height of the select object (doesn’t work), you name it !

*btw*: I don’t want to change the entire flow or to work with a different window model – to much work.

Any ideas ??