mohawk / uia gem setup

env.rb

require 'mohawk'
require 'rspec-expectations'
require 'childprocess'

World(Mohawk::Navigation)
Mohawk.default_adapter = Mohawk::Adapters::UiaAdapter # use uia rather than RAutomation

Gemfile

source 'http://rubygems.org'

# ...
gem 'mohawk', git: 'git://github.com/leviwilson/mohawk.git', branch: 'uia_gem'
gem 'uia', git: 'git://github.com/northwoodspd/uia.git'
# ...

irb.rb

require 'mohawk'

Mohawk.default_adapter = Mohawk::Adapters::UiaAdapter
Mohawk.app_path = './TelerikWpfApp1.exe'
Mohawk.start

class MainWindow
  include Mohawk
  window(title: /MainWindow/)
  
  menu_item(:subitem_one, path: ['Item 1', 'Sub Item 1'])
end

main = MainWindow.new
main.click_subitem_one
main.subitem_one # fails, because of the modal dialog
  

You'll want to gem update mohawk as I had to add the click_#{menu_item} accessor to mouse click rather than select. Select causes an issue if the Invoke on the menu item doesn't return immediately. In this case, because of a modal dialog (see the Notes here).