How to create new menu?

• New Blank Menu:
  
  Click "Blank Menu" under the "File" => "New" menu or click "New" toolbar button, a new empty tree menu will be created.
   
• New from Templates:
  
  Click "From Templates" under the "File" => "New" menu, or click "New from Templates" under "Template" main menu, then the "New from Templates" dialog will pop up, select a template then press "OK",  a new tree menu based on the template will be created.
   
• Open existed menu:
  
  Click "Open..." under "File" main menu or click "Open" toolbar button, then select a ".atm" file and press "Open" button on the "File Open" dialog, a existed tree menu is opened now.