Rad textbox getting lost on mouse over

[Ebenezer]

I am using the code below to show/hide a Radtextbox on item selected from  RadCombobox. For some reason the Radtextbox is disappearing on mouse over.
aspx file 
--------------------
<td class="rowcontent">
<telerik:RadComboBox ID="ddIdentifiedBy" runat="server" DataTextField="FullName" DataValueField="UserId"
  Font-Bold="False" Font-Names="Arial" Font-Overline="False" ForeColor="Black"  OnClientSelectedIndexChanged="OnClientSelectedIndexChanged">                                                                      
 </telerik:RadComboBox>                                                                     
  <telerik:RadTextBox ID="txtIdentifiedBy" runat="server" Style="margin-left:50px; visibility:hidden;">
   </telerik:RadTextBox>
    </td>
<script type="text/javascript">
    function OnClientSelectedIndexChanged(sender, args) {
        var textbox = $find("<%= txtIdentifiedBy.ClientID %>");
        if (args._item._text == "Other") {
            textbox._element.style.visibility = "visible";
        }
        else {
            textbox._element.style.visibility = "hidden";
        }
    }
</script



code behind to for the RadComboBox
-------------------------------------------------

  ddIdentifiedBy.Items.Insert(1, new RadComboBoxItem("Other"));

[Princy]

Hello Ebenezer,

One suggestion is to try the same functionality from server-side code as follows.

ASPX:

<telerik:RadComboBox ID="RadComboBox1" runat="server" DataSourceID="SqlDataSource1" AutoPostBack="true"
    DataTextField="ContactName" OnSelectedIndexChanged="RadComboBox1_SelectedIndexChanged">
</telerik:RadComboBox>
<telerik:RadTextBox ID="RadTextBox1" runat="server" Visible="false">
</telerik:RadTextBox>

C#:

protected void RadComboBox1_SelectedIndexChanged(object sender, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e)
    {
        if (RadComboBox1.SelectedItem.Text == "Other")
        {
            RadTextBox1.Visible = true;
        }
    }

Thanks,
Princy.

[Ebenezer]

Hi Princy,
I have tried your suggestion but this time the RadTextBox doesn't even show up. I think if I explain what I am trying to do, you may suggest something better. All I need is either allow the users to enter names which are not in the RadComBox and have it insert into a column in the database so when they click saved and come back they can see what they entered. I am trying to achieve this by Inserting "Other" as an option so when they click "Other" the textbox becomes visible so they can enter they text and click save. I can I achieve same by using AllowCustomText, but I don't see any example using Linq

[Ebenezer]

Fixed Thanks alot