Oracle Forms

I've implemented this into my application:

http://forms.pjc.bean.over-blog.com/article-14848846.html

Now suddenly the Calendar is no longer showing up on my canvas. I must have changed something that has stopped it from popping up? I click the button and the code fires without error, but no calendar is displayed. Has anyone else experienced this? Do you have any suggestions?

I have both the Calendar push button and the Bean object on seperate, non-base table control block and the item it populates is on my main base-table canvas.

The push button code is:

go_item('induction_info.drop_dt');
Set_Custom_Property('CTRL.BEAN',1, 'SET_PROPERTY','title,Drop Date');
Set_Custom_Property('CTRL.BEAN',1, 'SHOW_CALENDAR','50,50');


Thanks in advance.