if I understand you correctly, you have a component which contains a KeyHandler and a slot method receiving the key events. When you type some numeric keys on the PC keyboard, the slot method receives the events. But this only works, when you are prototyping the component - but not when you are prototyping the entire application.
I think this because of the missing focus. When you prototype the component separately, the component is focused. If you prototype the entire application, it seems that the component is not along the focus path. Can you check that?
For more information, please have a look to 'Keyboard events and focus path'.
Ask Embedded Wizard
Welcome to the question and answer site for Embedded Wizard users and UI developers.
Ask your question and receive answers from the Embedded Wizard support team or from other members of the community!