The behavior that you describe is most probably caused by JustCode's typing assistance feature. You can enable/disable it from the JustCode | Options | General.
What you want to achieve is possible using JustCode's templates. First select the code you want to surround with try/catch.
Then hit Alt + End
(or select from JustCode's menu "Show Available Code Commands..."
) in order to show the "Code" menu. There you will be presented with all current "surround with" templates and the try/catch template is there. After selecting it JustCode will surround your code with a try/catch statement.
I hope this helps and if you have any other suggestions or problems, please don't hesitate to write back.
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