formroller RollUp property
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Applies to
acFormRoller component.  

property RollUp: Boolean;  

The RollUp property determines whether the form is rolled up or down and the form's height is reduced (RollUp is True) or expanded to it's normal state (RollUp is False). Change this property at run-time to reduce or expand the window.  
When you change this property at run-time, button and menu item in the system menu will be changed accordingly — rollup when RollUp is False and rolldown when RollDown is True.  
tip User can not resize the form when it's height is reduced (rolled up).  

See also
RemainHeight property, OnRollerChanged event.