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Like sizers, SizerItem objects are not actual UI controls with any visibility, but instead can be best thought of as rules that govern the position and size of the UI controls they manage.

When an item is added to a sizer, a SizerItem object is created. The SizerItem object contain the rules that govern the appearance of the control; by changing the value of the SizerItem properties, you change the appearance of the control in the UI.