This method will be invoked when a different part of the document becomes visible. This override will do the following if this means that another page becoms the current one:

• Execute the javascript close action for the old current page.
• Raise the CurrentPageChanged event.
• Execute the javascript open action for the new current page.

protected override void OnVisibleRectangleChanged(
	EventArgs e
)

Protected Overrides Sub OnVisibleRectangleChanged ( _
	e As EventArgs _
)