[plt-scheme] Learning to use MrEd

In trying to learn how MrEd is used, I have run into a problem with the 
documentation.  The introduction is quite good and has good examples of how 
to create a frame and buttons, but for the rest I've understood better by 
searching the drscheme source code.

Does anyone have short examples that show an input field and/or highlighting 
and right-click pop-up menus? 
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