MS Chart Rectangular Annotation width in percent and not pixel

Question

why is it that the MS chart rectangular annotation width is in percent and not pixel like msdn says it is? https://msdn.microsoft.com/en-us/library/system.windows.forms.data

Answer 1

I know the OP wanted to set the width in pixels, but in case some people (like me) want to set the width neither in pixels nor in %, but according to the actual values, just set :

annotation.IsSizeAlwaysRelative = False
annotation.Width = whatEverValue