_ResizeBy
void _ResizeBy(int32 deltaWidth, int32 deltaHeight);
virtual void _ResizeBy(BPoint offset, BRegion* dirty);
void _ResizeBy(BPoint offset, BRegion* dirty);
void _ResizeBy(float, float);
_ResizeBy(0, newHeight - fCachedMinHeight);
_ResizeBy(width - Bounds().Width(), height - Bounds().Height());
_ResizeBy((int32)deltaWidth, (int32)deltaHeight);
_ResizeBy(widthDiff, heightDiff);
fTopView->_ResizeBy(deltaWidth, deltaHeight);
_ResizeBy(offset, dirty);
virtual void _ResizeBy(BPoint offset, BRegion* dirty) = 0;
virtual void _ResizeBy(BPoint offset, BRegion* dirty);