Visual studio WPF add new costume properties to ErrorBarType

Question

I want add new personalised propertie to ErrorBarType, but I not get how to do, when I add the new name, ErrorBarType only show options like: StandardError(1), FixedValue (10), Percentage(10) and StandardDesviation (1).
someone knows make that ? This is a little part of My Main aplication, the completed add is very long
https://code.sololearn.com/c7TlmO423USW/?ref=app
Thanks

Answer 1

For example:
Public string text
{
Get{return;}
Set{textbox1.text = value;}
}