Add event listener

[explorer]

I have DateChooser component, I get "meeting info" from database, I
have i datagrid list of tasks for certain date. Now when user click on
some task it populate form for entering new scheedler, but my problem
is I can t triger function to coolect date. It s not clicked, it s set
by using
component.selectedDate = date // from database

So when user edit information for some task there is no date value,
any idea

Thx