This method is called when the window hosting a <code>Browser</code>
is requested to be hidden. Application would typically hide the
{@link org.eclipse.swt.widgets.Shell} that hosts the <code>Browser</code>.
<p>
<p>The following fields in the <code>WindowEvent</code> apply:
<ul>
<li>(in) widget the <code>Browser</code> that needs to be hidden
</ul>
@param event the <code>WindowEvent</code> that specifies the
<code>Browser</code> that needs to be hidden
This method is called when the window hosting a <code>Browser</code> is requested to be hidden. Application would typically hide the {@link org.eclipse.swt.widgets.Shell} that hosts the <code>Browser</code>. <p>
<p>The following fields in the <code>WindowEvent</code> apply: <ul> <li>(in) widget the <code>Browser</code> that needs to be hidden </ul>
@param event the <code>WindowEvent</code> that specifies the <code>Browser</code> that needs to be hidden
@see org.eclipse.swt.widgets.Shell#setVisible(bool)
@since 3.0