par->ComputeContainerSize();
par->ComputeScrollOffsets(PR_TRUE);
void CornerView :: Show(PRBool aShow, PRBool aRethink){  if (mShow != aShow)  {    mShow = aShow;    if (mShow == PR_TRUE)      mViewManager->SetViewVisibility(this, nsViewVisibility_kShow);    else if (mShowQuality == PR_FALSE)      mViewManager->SetViewVisibility(this, nsViewVisibility_kHide);    if (PR_TRUE == aRethink)    {      nsIScrollableView *par;      if (NS_OK == mParent->QueryInterface(kIScrollableViewIID, (void **)&par))        par->ComputeContainerSize();    }  }}