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validating data in a toolbox

Question asked by stashaestha1 on Jan 4, 2018
Latest reply on Jan 4, 2018 by JQuinn-esristaff

I have a check box  and i want the input below it to be enabled only when the check box is checked. I know this is done in the validation of python script tool. But i have no idea where to begin. any help would be appreciated. below is a part of my tool box:

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