'Declaration Public ReadOnly Property DefaultImage As SimpleImage
public SimpleImage DefaultImage {get;}
Using this property is preferable to using the Image property because you can set alternate text to make the button more accessible for users when Section 508 rendering is turned on.
Alternate text on the button's image produces a tool tip in most browsers, which may supercede any setting made to the button's ToolTip property when the user hovers above the graphic image of a button.
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