NS_IMETHODIMP nsWidget::SetPreferredSize(PRInt32 aWidth, PRInt32 aHeight) { return NS_OK; }
inline NS_IMETHOD SetPreferredSize(PRInt32 aWidth, PRInt32 aHeight) { mPreferredWidth  = aWidth; mPreferredHeight = aHeight; return NS_OK; }
NS_IMETHODIMP nsWidget::SetPreferredSize(PRInt32 aWidth, PRInt32 aHeight){  return NS_OK;}