This method gets the natural size of a control.
HRESULT get_NaturalSize( long *plWidth, long *plHeight);
NOERROR indicates success. If an error occurs, the appropriate HRESULT value is returned.
The natural size of a control typically consists of the dimensions a control would need to display its contents. For example, the natural size of a label control with a ASFC_ALIGN_SINGLELINE format is the width required to display the control’s full caption.