RadTextBox.get_value() showing blank after post back

[kartik]

Hello,

I have a RadComboBox (with AutoPostBack="True"), a RadTextBox and a button. I select a value from RadComboBox then after post back
i enter some value in the RadTextBox and click on the button. On button's client click, i am using following javascript code:

            var description = $find("<%=RadTextBox.ClientID%>");
            if (description.get_value().trim() === "") {                
                msg += "Description is required\n";                
            } 

But description.get_value() shows blank even though i have enterted some value (before post back). This issue is only 
with IE 11.0.9600. In IE 11.0.10240 and chrome this works fine.

I am using telerik version 2016.1.113.45

Please advise.