my code source ..
function test() {
var wre = Sys.Application.findComponent("WebResizingExtender1");
alert (wre); // ?
wre.setSize(400, 200);
}
WebResizingExtender control name : WebResizingExtender1
updatepanel control name : up_test
WebResizingExtender1 ..setting ..
TargetControlID : up_test
promgram run ... message box 'null'
why? help me plz. :)