" Does anyone knows how to do this"
Yes, I know how to do this... And you?
Where are you stuck? Making buttons? If you search the forum, you will find plenty of button examples. Basically, it is a matter of making rectangles and detecting click inside them.

Thanks for the quick correspond, I really have no idea on  how to do this, I would be very glad if you can do this to me. The below information is the speciafication on how the program should like:

The program should be able to draw rectangles and circles that can be one at 3 sizes and one of 3 colours.  by Clicking on the buttons at the bottom of the screen allows the user to choose the type of shape and its size and colour.   Clicking anywhere else on the canvas draws the shape using the currently chosen options.  (array should be used to store the text to be display on each button.

 If you could manage to do asap will be appreciated.

Thanks

ha!

Look at PDE's Examples, Topics > GUI, there are several Button examples.