Modify some properties of graphical components

• guiposition: locates the graphical element on a specific place with its coordinate. For example, if you want to put the button at the point with coordinates $(20;100)$, you will write:
  

   guiposition "b [20 100]
  

  
  
  If you don't specify a location for the component, il will be placed by default on the upper left corner of the drawing area.
  
• guiremove: Remove a graphical component. For example, to delete the button:
  

   guiremove "b
  

  
  
  
• guiaction: Defines an actionfor the component when the user interacts with it.
  

  # the turtle forwards of 100 if we click on the button "b
   guiaction "b [fd 100 ]
  
  # For the combo menu, each  item has its own action
  guiaction "m [[print "item1]  [print "item2] [print "item3]]
  

  
  
  
• guidraw: Dispalys the graphical component on the drawing area. For example, to display the button:
  

   guidraw "b