Dear Hans,

Thank you for your answer.

> 
> \framedtext[empty=yes]
> 

Yes, it clears everything in the frame.
But the frame is also clean when I disable \hideSolution. In that case, texts 
should be appeared.
What I want is the following:

If \hideSolution then
        hide text and add more blank spaces
else
        show full text and no more space.
endif

The full text  for the students another for the lecture.

Is there a way not using \framedtext?

Thank you again.
Best regards,

Dalyoung

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