Hi,
the two hints, you may just ignore them; they just inform you that
within the event handler you are not using the parameter.
Then, for the errors:
max_y := inttostr( max_y_param.text );
// ^^^^^^^^^^^ it is a TEdit
inttostr _gets_ an integer as parameter and produces its representation
string. You probably wanted to use strtoint, instead.
Cheers, A.
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