Question: Using a Slider (component) to updata a variable

I have inserted a slider into my Maple workshet and in the edit box I typed:  Do(A=%Slider1);

and now I am simply calling the variable A by typing:  A;

but the variable is not updated. I have to set the slider value and then reexecute A in order to get

a updated value of A. but I want A to be updated automaticaly without having to reexecute it......

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