Radeditor error using image manager in IE9

I am using RadEditor inside Update Panel. On using image manager in i got error in IE9

Microsoft JScript runtim开发者_JAVA百科e error: DOM Exception: INVALID_CHARACTER_ERR (5)

whereas image manager works in IE8

inside update panel i have

< telerik:RadEditor ID="RadEditor1" ExternalDialogsPath="~/EditorDialogs" runat="server" Width="500px" Height="250px" EditModes="Design" ToolsFile="~/ToolsFile.xml" > < ImageManager ViewPaths="~/myPics" UploadPaths="~/myPics" />

on code behind i used

Telerik.Web.UI.RadFileExplorer rfe = (Telerik.Web.UI.RadFileExplorer)this.FindRadControl(this.Page); if (rfe != null) { rfe.Upload.EnableFileInputSkinning = false; }

private Control FindRadControl(Control parent) { foreach (Control c in parent.Controls) {

        if (c is Telerik.Web.UI.RadFileExplorer) return c;
        if (c.Controls.Count > 0)
        {
            Control sub = FindRadControl(c);
            if (sub != null) return sub;
        }
    }
    return null;
}  

Please help.