while rendering telerik RadHtmlChart gives error Uncaught TypeError: Cannot read property 'UI' of undefined

while rendering telerik RadHtmlChart gives error Uncaught TypeError:
Cannot read property 'UI' of undefined

i am using visual studio 2008 and telerik Q3 2013.chart works properly
when i register it on a page(asp control i.e ascx).but while rendering it
continuously(in loop) gives me error as Uncaught TypeError: Cannot read
property 'UI' of undefined
ScriptResource.axd?d=AgoCPu05OxdzLRJ2qizgpccNdLkxYewZ8N4JzKUS9mdzBHAyhsZr7G…k4-K_hbRuGnlXWs-7UZEMpYKAki3OSwc1RpaubKY1VrULttWicRrhv-xIbJo1&t=470de87b:2
Sys.Extended.UI.FilteredTextBoxBehavior._onchange
ScriptResource.axd?d=AgoCPu05OxdzLRJ2qizgpccNdLkxYewZ8N4JzKUS9mdzBHAyhsZr7G…k4-K_hbRuGnlXWs-7UZEMpYKAki3OSwc1RpaubKY1VrULttWicRrhv-xIbJo1&t=470de87b:2
(anonymous function)
ScriptResource.axd?d=mg8OiUtZCqCr5IUVSY7Fqq8BWt0l-ODKSw6qoT758F6f55kGrsTqHcpmZeCmDvfYtLk0UsGCbs7k3GRbNgAa-Sr8CAbXsDF2caMHloPstV04ztoF0&t=470de87b:2
Sys.Extended.UI.FilteredTextBoxBehavior._intervalCallback
ScriptResource.axd?d=AgoCPu05OxdzLRJ2qizgpccNdLkxYewZ8N4JzKUS9mdzBHAyhsZr7G…k4-K_hbRuGnlXWs-7UZEMpYKAki3OSwc1RpaubKY1VrULttWicRrhv-xIbJo1&t=470de87b:2
(anonymous function)