Writing Greek Symbols in an 'edit text box'

Is it possible to have greek symbols displayed in an edit text box? I know it works for static text box but I wanted it to work for edit text.

I have the sigma sign on the pushbutton. I am using this in the opening function to display it.

set(handles.pushbutton1,'String','S','FontName','symbol','FontSize',12)

Now the problem is the signma is to be used as an input in the edit box by the user, which means that if the user presses this sigma button the sigma sign should appear in the edit text box. This is something I cannot do. Edit does not accept symbols.