Message: Sys.ArgumentNullException: Value cannot be null. Parameter name: panelsCreated[2]I struggled for quite some time trying to figure out what to do about it. If you do a Google search, you'll come across lots of people struggling with this error and the responses pointing at the AJAX Toolkit. However, in my case, I wasn't using the AJAX Toolkit directly. Rather, I was using Telerik's ASP.NET/AJAX controls.
What I was doing seemed simple enough. I needed certain RadPanels to show up on the page while others are hidden (<- a="" ajax="" and="" as="" be="" behind="" big="" browser.="" by="" c="" cannot="" class="brush: cpp; toolbar: false" code-behind="" code="" control="" controls="" css="" d="" didn="" display="" displayed.="" do="" don="" error="" false.="" find="" foreshadowing="" frankly="" hidden="" hiding="" i="" if="" in="" include="" instead="" interface="" is="" issue.="" it="" key="" like="" look="" may="" modify="" no-no.="" not="" of="" or="" out="" pops="" pre="" property="" radpanel="" render="" root="" s="" same="" setting="" should="" simple="" so="" solution="" something="" t="" tag="" telerik="" that="" the="" their="" then="" this:="" this="" to="" toolkit.="" true="" turns="" up="" use="" visible="" want="" wants="" was="" when="" whether="" with="" you="">radDock.Style.Remove("display"); // Visible = true
radDock.Style.Add("display", "none"); // Visible = false
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