The problem was that two lines in the constructor event of this ddlb "invalidate" the event execution. So, the create statement and the dataobject assignment to the instance datastore (coded in constructor event) do not execute, causing all references to it to be null.
This two lines are:
This.Sorted = False
This.VScrollBar = True
What am I doing wrong ? Acording to Appeon documentation, this two properties are supported.
PB903
Appeon 2015 Developer (evaluation)
Web Project
.net Appeon Server
32 bits OS
IE Browser
Regards ....