The ruler displays tick marks for each display column. The width of the display columns is based on the average width of a character rendered with the current font. As a result, the ruler is only useful when the XamSyntaxEditor is using a fixed width font. In fact, if you choose to display the ruler when the control is using a proportional font, the ruler's column positions will not align with the character positions in the text.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, 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