f4 help for date column in the ALV Editable

Hi,

In the output of ALV, there is a date column which is one of the editable fields.

when i presses f4 help it should popup the calender to select the date as such we do for standard screens in the alv output.....

pls provide me with the code for the f4 help for the date field in the alv output editable column...I generated alv using function modules......