You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: panel_scout.m
    path of file: ./repos/brainstorm3/toolbox/gui
    
    the code of the file until where you have to start completion: function varargout = panel_scout(varargin)
% PANEL_SCOUT: Create a panel to add/remove/edit scouts atta
    
function SetScoutRegion(Region)
    % Ask region if not defined
    if (nargin < 1) || isempty(Region)
        Region = java_dialog('input', 'Brain region for the selected scouts:', 'Set scout region', [], 'UU');
        if isempty(Region)
            return
        end