int todayOffset = getOffsetFromStart();
FigureCanvas canvas = (FigureCanvas) ppEditor.getGraphicalViewer().getControl();
canvas.scrollToX(todayOffset);

public class MyFreeformRootEditPart extends ScalableFreeformRootEditPart {

	@Override
	public void setContents(EditPart editpart) {
		super.setContents(editpart);
		scrollToStart();
	}
}

	protected void configureGraphicalViewer() {
		super.configureGraphicalViewer();

		GraphicalViewer viewer = getGraphicalViewer();
		viewer.setEditPartFactory(new ShapesEditPartFactory());
		viewer.setRootEditPart(new MyScalableFreeformRootEditPart());
		viewer.setKeyHandler(new GraphicalViewerKeyHandler(viewer));

public class MyScalableFreeformRootEditPart extends
        ScalableFreeformRootEditPart {

    @Override
    public void setContents(EditPart editpart) {
        super.setContents(editpart);
        scrollToStart(editpart);
    }

    /**
     * @param programPlan
     * 
     */
    private void scrollToStart(EditPart editpart) {
        FigureCanvas canvas = (FigureCanvas) editpart.getViewer().getControl();
        int theOffset = 80;
        canvas.scrollToX(theOffset);
    }
}

private void scrollToStart(EditPart editpart) {
    final FigureCanvas canvas = (FigureCanvas) editpart.getViewer().getControl();

    Display.getDefault().asyncExec(new Runnable() {

        @Override
        public void run() {  
	    if (!canvas.isDisposed()) {
	        canvas.scrollToX(80);
	    }
        }
    });
}