Returns the widget's adjustment child. The returned value should be assigned
by reference if you want method calls and other changes to be shown in the
adjustment's parent widget.
Example 35. Change the current value of an HScale
<?php
// Create an hScale object
$hScale = &new GtkHScale(new GtkAdjustment(.5, 0, 1, .1, .1, .1));
// Get the adjustment from the hScale
$adj =& $hScale->get_adjustment();
// Set the value to zero
$adj->set_value(0);
?>
