If this is not specified, the image will be drawn according to it's native height. If the height here differs from the native image height, the image will be stretched (or shrunk) to fit.
Stretching (or shrinking) may lead to distortion of the image. It is the application's responsibility to not specify image heights disruptive to the control or form layout.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2