TIWCGJQMultiSelectOptions.SearchHeader Property
Specify the list header that will receive the search field. For example, if you set the availableListPosition to "bottom", the search field will toggle in the middle of the widget. Unless you specify searchHeader to "selected", in which case the search field will be located at the top. You may also set filterSelected to true for even better results.
published property SearchHeader: TIWCGJQMultiSelectOptionsSearchHeader index 07 read GetSearchHeader write SetSearchHeader stored IsEnumerStored;