attached example uses the same ListModel with ListSubModel for a Chosenbox and a Combobox

when the method getSubModel is called, the value of parameter nRows is inconsistent between both components
for combobox -1 is passed
for chosenbox 50000 is passed

in any case the value can be ignored (as it is not required for these components) but should be consistent (I'd suggest -1 as it is meaningless anyway)