Question: Simple Interactive Button

Hi all, I'm trying to create a button on Maple that solve a simple function, I've set y=(ln(2))x, I have created a text area called Text where you can set the value of x, a button that solves the function and another text area called Result where you can see the result.

Here's my code

use DocumentTools in 
end use; 

It doesn't work, if I set x=0.1 then on Result will appear this text 0.1e2*ln(2).

Can anybody help me? Thanks

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