GetUIElement:
-------------------------------------------------------------------------------
Get certain properties of UIElements.
property
--------
'visible'
'position'
'datastructure'
If the handle is for a uicontrol it will return
the property of that uicontrol.
-------------------------------------------------------------------------------
Form:
x = GetUIElement( h, property )
-------------------------------------------------------------------------------
------
Inputs
------
h (:) Handle
property (1,:) Property
-------
Outputs
-------
x {:} Depends on the property
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Children:
Common: General/Cell2DToStruct