simple event, OnKeyboardHit (same as OnActivate, only it requires the player to be touching it for it to work) and then a box where you enter one of your keyboard keys, so when you're touching that brick, and you click that button, it activates the event
example:
OnKeyboardHit [ J ] self setcolor
- when the player is touching the brick, and hits J on his/her keyboard, the brick will change its color to the selected color