Custom Object ?Resursive? Events

I have a custom userform Control, clsTwoInput.

Basically, it is a Frame that contains a CheckBox and two InputBoxes.
The CheckBox toggles the visibility of the InputBoxes and the clsTwoInput.Value is the .Value of the visible InputBox.

Each of the InputBoxes is either a TextBox or a clsTwoInput.

This works fine, until I try to get the clsTwoInput to generate a Change event.

Here is my current clsTwoInput code.
When I try to add WithEvents to the declaration of clOneInput, I get an compile error "Cannot handle events for the object specified"

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In the attached user form, OuterInput is a clsTwoInput that has its checkbox, one text box and one clsTwoInput, InnerBox.
Changing OuterInput by clicking the checkbox or by typing into the checkbox will trigger the OuterInput_Change event, but changing InnerBox will not.

Is there a way for a custom object, that has a different instance of that object as a property of that object, to receive Events from the sub-instance of itself?