CComControlBase::m_sizeExtent
The extent of the control in HIMETRIC units (each unit is 0.01 millimeters) for a particular display.
SIZE m_sizeExtent;
Remarks
Note
To use this data member within your control class, you must declare it as a data member in your control class. Your control class will not inherit this data member from the base class because it is declared within a union in the base class.
This size is scaled by the display. The control's physical size is specified in the m_sizeNatural data member and is fixed.
You can convert the size to pixels with the global function AtlHiMetricToPixel.
Requirements
Header: atlctl.h