I am using following code to do this
EditingCommands.ToggleSuperscript.Execute(null, richTextBox);
This is working perfectly for Plationo Linotype Font Family .
My problem is that this is not working for some characters like minus -,*,@,#,%,^,_,
But it works for these characters +,=,!,$,&,(,),?
Please tell me what is problem here , If there is any other solution for it please suggest me.
its very urgent.