Nov 29, 2013 08:24 AM|fur.attila|LINK
Hi Happ Chen,
The code isn't working for me. The error is :
An unhadled exception has occured.
Value cannot be null.
Parameter name: child
see the following link: http://mcleod.hu/pics/3.png
Probably the removal of //ViewState["CalendarImageButton"] = new ImageButton();
caused this. There is no object created in the CreateChildControls method of the CustomControl. (When I uncomment this part, the control renders, but shows the same error, detailed above)