multiple MultiComboBox on different forms and same option data source not working

[lveronese]

Hi,

I'm having a problem with MultiComboBoxItem. I have two forms with distinct MulitComboBox items bound to the same optionDataSource.
When I perform a selection from one of the MultiCombos it works properly, but then if I make a selection from the other one the control refuses to make a selection and ignores the operation.
I can see the list of options but when I select one the button for the selection does not appear.
I'm currently using v11.0p_2016-08-18/PowerEdition Deployment (built 2016-08-18)

Can you tell me if this behaviour is expected when the items share the same data source?
Is there a workaround that does not require me to duplicate the data sources?

Thank you.

[Isomorphic]

It is not expected that they would interfere. If you can create a minimal, ready-to-run test case demonstrating the effect, we can take a look. As with test cases in general, we recommend starting from a sample, or at least using one of the available sample DataSources.