Search not enabled until SearchOptions set

The 'Find Next' button will not become enabled until I assign a new SearchOptions object to the EditorSearchView.SearchOptions Property. Once I assign one manually in my Loaded event I can then search my document. Inspecting the SearchOptions Property shows that it's null but one might think that it should either construct one by default or raise some sort of error - having a mysteriously disabled button doesn't seem like the best solution.