* Sets the page size to the given <code>Dimension</code> object.
*
* @param pgSize page size
*/
public void setPageSize(Dimension pgSize){
CTSlideSize sz = CTSlideSize.Factory.newInstance();
sz.setCx(Units.toEMU(pgSize.getWidth()));
sz.setCy(Units.toEMU(pgSize.getHeight()));
_presentation.setSldSz(sz);
}