https://bugzilla.redhat.com/show_bug.cgi?id=1155707 - only certain event
types have a DataInput or DataOutput - need to check for that.
https://bugzilla.redhat.com/show_bug.cgi?id=1138987 - add a Language
text field to Timer Event Definition property sheet. Also fix an update
problem when event definition is removed from an event.
https://bugzilla.redhat.com/show_bug.cgi?id=1138987 - Messages field
name change for timer script language