openDropDownSearch method
Public Function that return then UI based on searchMode
data
selected item to be passed to the UI
If we close the popup , or maybe we just selected
another widget we should clear the focus
THIS USED FOR OPEN DROPDOWN_SEARCH PROGRAMMATICALLY,
otherwise you can you _selectSearchMode
Implementation
Future<T?> openDropDownSearch() => _selectSearchMode(_selectedItemNotifier.value);