I create a control in CreateChildControls():

HtmlGenericControl mycontrol= HtmlGenericControl("li");
mycontrol.ID = "controlID";

controlId = mycontrol.ID;


protected virtual IEnumerable<ScriptDescriptor> GetScriptDescriptors()
{
        ScriptControlDescriptor descriptor = new ScriptControlDescriptor("Project.TEditor", this.ClientID);                   

        descriptor.AddProperty("controlId", controlId);           
        return new ScriptDescriptor[] { descriptor };          
}

Then in javascript i try to find this control using the ID property:

 alert($get(this.get_controlId()));

I get null because the actual control ID has a prefix that was added by asp.

How to solve that?