Use the hWnd property to get the control's main window handle. Use the Calendar.hWnd property to get the handle of the calendar panel. The Microsoft Windows operating environment identifies each form and control in an application by assigning it a handle, or hWnd. The hWnd property is used with Windows API calls. Many Windows operating environment functions require the hWnd of the active window as an argument. Use the Parent property to move the calendar panel to other place.