How to access component properties in runtime

This is probably a 'newbie/stupid' question but i must be missing some basic knowledge to get started using Delphi for php.

Let's say i make a new project, with one unit, add a window component and a mainmenu on the window.
Put a button on the window and in the php onclick event of the button i writeThat doesn't work; ok let's tryDoesn't work either..both give a 'undefined or no object' error.
What am i doing wrong?
Also, when does one use the '->' and when '.' to access component properties?
And how do i access component properties in the JS events?
The only thing i got to work in js event is Window1.maximize();