Hello Pidea,
the provided screenshot did not contain the callstack. The important messages are displayed in the section Debug as mentioned little imprecisely 'below'. To attract your attention the tab Debug is blinking in such case the thick gray bar:
When you click on the tab Debug the Log window will display the mentioned callstack entries. Evaluating those reveals that in your application you tries to change the number of list items during loading an item:
Since such operation will require the list to reload items again, doing this within OnLoadItem may lead to an endless recursion. This has been detected by Embedded Wizard and suppressed.
Generally, during the list is reloading items, your implementation may not modify any states of the corresponding list. The implementation of the OnLoadItem method should limit to the load operation only. Consequently, following two rows have to removed from the OnLoadItem method:
ListBox.NoOfItems = maxItem;
ListBox.SelectedItem = defaultItem;
Best regards
Paul Banach