C# Scale RTF text in a richtextformatbox

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C#

forms

form

RichTextBox

Hi im working on some sort of a text editor for fun, and i ran into a problem, i wanna scale the text selected or all text in a rtfbox, im wel aware of ".Zoomfactor" but this dont scale the "text" so it doesn't give the wished result. Also it must be a scaling, so i cant just say font.size *= x since this will give all text the same size from my knowledge. please, if anyone could help me out either provide some sample code or give some leads to use full websites (even that it feels like i've been around the most sites) i would be great full.

Thanks - Jackie

EDIT: Just checked, word, and wordpad, and it does have this function im asking for, (increase/decrease text) in 2003 and newer it should be the buttons beside the text-size dropdown-menu