Enables the user to start an interactive search by typing in the text. When the property is set to true, the user will be allowed to search items in the tree view by simply typing the searched text contained in the view. The search column (the column that must match the user's text is the one specified by the SearchColumn property (property that defaults to the first column).
Return value:
Returns true if the user is allowed to start an interactive search on the tree view.