A form item is a data structure for representing a panel item (control, widget) in a form. It is returned from wxMakeForm... function and normally you will not need a handle to it except to pass it to wxForm::Add. However, you may wish to get the actual panel item from the form item, for example to disable the panel item. In which case, save a handle to the form item, then call (for example) wxFormItem::GetPanelItem after you have associated the form and the panel or dialog box.
wxItem * GetPanelItem(void)
Gets the panel item for this form item. Must only be called after wxForm::AssociatePanel has been called.