unction will render a button on
	the screen. This function returns the value <code>true</code> if it has been
	clicked on.
</p>

<h2>
	Pushing frames
</h2>

<hr/>

<p>
	Frames can be created using absolute coordinates, or pushed relative to the
	underlying frame. For example, pushing frame 100 pixels from
	<code>FRAME_TOP</code> will create a frame with the topmost 100 pixel rows
	from underlying frame. Switching it to <code>FRAME_TOP_INV</code> will skip
	the topmost 100 pixel rows and select everything be