Conditional Property Types within Custom Widget Definitions

Hi,   I noticed in the new Combo box widget Mendix are somehow using conditional visibility on the input types depending on what you select, it will show different results.   I have looked through the mendix documentation and cannot see how they have done this.   Notice how the clearable hides when switched from Enumeration -> Boolean.     Additionally I converted the combox into a zip, looked at their source definition xml file and can not see anything here either.     Anyone know how its done? I feel like I'm missing something simple   Thanks Adam
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