DisclosurePanelImages alternative?

DisclosurePanelImages is depreciated, so I wondered whats the correct
method for getting to the Disclosure panels default images?

(for, say, making a custom header)

My old code was;

final DisclosurePanelImages dpimages = (DisclosurePanelImages)
GWT.create(DisclosurePanelImages.class);

class DisclosurePanelHeader extends HorizontalPanel
{
AbstractImagePrototype closedImage =
dpimages.disclosurePanelClosed();
AbstractImagePrototype openImage = dpimages.disclosurePanelOpen();
Image arrowImage = closedImage.createImage();

public DisclosurePanelHeader()
{
......

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