<Default> (Default Button)
This element specifies that the object is a default (OK) button .  If this element is specified without a value, it is assumed to be true.  This element is used for buttons.
example: 
<x:ClientData … > …
  <x:Default>True</x:Default>
</x:ClientData>
The possible values for this element are defined by the ST_TrueFalseBlank simple type (§6.4.3.3).
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