If I run the jscript function [Disable] on a button click, it works perfect, but, when this function is called by the window.onload, I get a error. The error ocorre because $find doesn't return a valid object, instead, it return a null. Why this happen? There is a way to work around it?
Use the default pageLoad() method rather than window.onload. The cause of the problem is the control is not rendered on page when calling the window.onload method. The pageLoad fires only after all the ajaxified controls rendered on page.
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