That should work, but what happens when you implement that code?

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There is no change in the behavior of my custom control.It works exactly the same.

Do you think i need to add something in the javascript for Enter(keycode==13) or for postback??

Thanks
Kamal

have you set the autopostback property of the control to true?

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Yes. Positively.Here is the code .

<cc1:SmartDropDown id="SmartDropDown1" style="Z-INDEX: 102; LEFT: 132px; POSITION: absolute; TOP: 182px" runat="server" Width="159px" AutoPostBack="True" Height="38px">

Have you specified in your code when those methods above are to be triggered and by which action triggers those events?

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I dont understand ...you mean in Custome control ?

Give me a bit ill write a solution to this.

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No problem. Let me know if you need any information from my side.

Thanks a ton.You are so kind.
Kamal

P.S. I am still trying though.

After looking at the source of that control you are using, there is nothing in the JavaScript that I can see raises the postback event.

Do you have a method in your code behind that is handling the postback?

Something like:
    Private Sub drp_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles drp.SelectedIndexChanged
        'do something
    End Sub

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protected string GetScriptBlock(string clientID)
        {
                StringBuilder sb = new StringBuilder();

                sb.Append("<SCRIPT lang='JavaScript'>");
                sb.Append(" var typeAheadInfo = {last:0, currentString:'', delay:20000, timeout:null, reset:function() {this.last=0; this.currentString=''}};");
                sb.Append(" function typeAhead(ctrl) {");
                sb.Append(" if (window.event && !window.event.ctrlKey) {");
                sb.Append(" var now = new Date();");
                sb.Append(" if (typeAheadInfo.currentString == '' || now - typeAheadInfo.last < typeAheadInfo.delay) {");
                sb.Append(" var myEvent = window.event;");
                sb.Append(" var selectElement = myEvent.srcElement;");
                sb.Append(" var keyCode = myEvent.keyCode;");
                // The NumPad returns slightly differant keyCodes then the numbers on the type of the keyboard.
                // If we subtract 48 it will return the correct keyCode.
                sb.Append(" if (keyCode >= 96 && keyCode <=105) {");
                sb.Append(" keyCode = keyCode - 48;");
                sb.Append(" }");
                //this traps the enter, and causes a post back
                sb.Append(" if (keyCode == 13) {");
                sb.Append(" __doPostBack('" + clientID + "','');");
                sb.Append(" }");

                sb.Append(" var newChar = String.fromCharCode(keyCode).toUpperCase();");
                sb.Append(" typeAheadInfo.currentString += newChar;");
                sb.Append(" var selectOptions = selectElement.options;");
                sb.Append(" var txt, nearest;");
                sb.Append(" for (var i = 0; i < selectOptions.length; i++) {");
                // change this from .text to .value to use the value of the item instead of the visual text if desired
                sb.Append(" txt = selectOptions[i].text.toUpperCase();");
                sb.Append(" nearest = (typeAheadInfo.currentString > txt.substr(0, typeAheadInfo.currentString.length)) ? i : nearest;");
                sb.Append(" if (txt.indexOf(typeAheadInfo.currentString) == 0) {");
                sb.Append(" clearTimeout(typeAheadInfo.timeout);");
                sb.Append(" typeAheadInfo.last = now;");
                sb.Append(" typeAheadInfo.timeout = setTimeout('typeAheadInfo.reset()', typeAheadInfo.delay);");
                sb.Append(" selectElement.selectedIndex = i;");
                sb.Append(" myEvent.cancelBubble = true;");
                sb.Append(" myEvent.returnValue = false;");
                sb.Append(" return false; ");
                sb.Append(" }");
                sb.Append(" }");
                sb.Append(" if (nearest != null) {");
                sb.Append(" selectElement.selectedIndex = nearest;");
                sb.Append(" }");
                sb.Append(" } else {");
                sb.Append(" clearTimeout(typeAheadInfo.timeout);");
                sb.Append(" }");
                sb.Append(" typeAheadInfo.reset();");
                sb.Append(" }");
                sb.Append(" return true;");
                sb.Append(" }");
                sb.Append(" </SCRIPT>");
                return sb.ToString();
        }

This is my java script.If you will notice it says that if keycode==13 then do _doPostBack.
And then there is code on drp_SelectedIndexChanged but that just populates datagrid and other fields.

Other than that i dont have much.