Commented Issue: AsyncFileUpload1.Enabled = true not functioning well [27029]

I have few controls in a update panel and I had set all the controls enabled=false when Page_Load. I have one button to set all the controls enabled=true when onclick. There is a problem with one of the control which is AsyncFileUpload. First click all the controls was enabled except AsyncFileUpload. AsyncFileUpload only enabled if I click the same button twice. This is happen consistently.
Comments: We're having the same problem. Once AsyncFileUpload.Enabled = false, setting it back to AsyncFileUpload.Enabled = true does not enable it on the page. We had to work around this by putting the AsyncFileUpload inside a standard ASP.NET panel.