# Dynamic child controls

Child controls on a form are visible or hidden depending on whether their parent controls are selected. Study designers specify this behavior by defining a property on a control that is set in the Central Designer application during the study design. For more information, see Study design considerations.

A parent control may be either a radio button or a checkbox. When you do not select a parent control in the InForm application, this functionality allows the child control to be visible or hidden. For hidden controls, values in the child control are cleared, and the control does not occupy space on the InForm form.

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