I'm using radGrid and a xmlhttppanel,with in the xmlhttppanel i have some grids(to display project details) and a raddatetimepicker,radcombobox.When i login,the main grid displays all projects and when i select a gridrow the particular project details will be displayed in grids undertabs and the due date , status are displayed in datetimepicker and combobox respectively.when  change the status(in combobox) of my project and click a update button, the btnUpdate_Click has to update the database.after updating when i click combobox it works fine,but if i select any control other than the combobox,the values in combobox not popup,i mean no dropdown displaying.

Default.aspx:
 <telerik:RadGrid ID="RadGrid1" runat="server" >
   <ClientEvents OnRowSelected="rowSelected"></ClientEvents>
   <MasterTableView Width="100%" CommandItemDisplay="Top" ClientDataKeyNames="ProjectId"  DataKeyNames="ProjectId">
    </Mastertabkeview>
  </telerik:radgrid>

<telerik:RadXmlHttpPanel ID="RadXmlHttpPanel1" EnableClientScriptEvaluation="true"
                                    runat="server" OnServiceRequest="XmlHttpPanel_ServiceRequest" RenderMode="Block"
                                    Width="750px">
  <table><tr><td>
        <telerik:RadComboBox ID="cmbStatus" runat="server">    </telerik:RadComboBox>  
    </td>
  <td><telerik:RadDateTimePicker runat="server" ID="dtDuedate" Culture="en-US" FocusedDate=""   MinDate="">                                                                                                                 <TimeView CellSpacing="-1" runat="server">
                                                                </TimeView>
                                                                <TimePopupButton HoverImageUrl="" ImageUrl="" Visible="False" />
                                                                <Calendar UseColumnHeadersAsSelectors="False" UseRowHeadersAsSelectors="False"                                                                                                                ViewSelectorText="x" runat="server">
                                                                </Calendar>
                                                                <DateInput DateFormat="M/d/yyyy" DisplayDateFormat="M/d/yyyy" runat="server">
                                                                </DateInput>
                                                                <DatePopupButton HoverImageUrl="" ImageUrl="" />
                                                            </telerik:RadDateTimePicker>
  </td><td><asp:Button ID="btnUpdate" runat="server" Text="Update" OnClick="btnUpdate_Click"  /> </td></tr>
*******grids here**********
</table>
</telerik:xmlhttppanel>

Default.aspx.cs:
protected void Page_Load(object sender, EventArgs e)
    {
        ProTrakEntities objEntity = new ProTrakEntities();
        if (Page.IsPostBack)
        {
            if (Session["ProjectId"] != null)
            { 
               Control cause = GetPostBackControl(Page);
                    if (cause != null)
                    {
                        if (cause.ClientID != "btnUpdate")
                        {
                            ProTrakEntities ProEntity = new ProTrakEntities();
                            var Status = (from type in ProEntity.ProjectStatus select type).ToList();
                            cmbStatus.DataSource = Status;
                            cmbStatus.DataValueField = "StatusId";
                            cmbStatus.DataTextField = "Status";
                            cmbStatus.DataBind();
                            cmbStatus.SelectedValue = Query.StatusId.ToString();
                        }
                    }
                }
             }
       if (!Page.IsPostBack)
        {
           if (Session["ProjectId"] != null)
                {                 
                        ProTrakEntities ProEntity = new ProTrakEntities();
                        var Status = (from type in ProEntity.ProjectStatus select type).ToList();
                        cmbStatus.DataSource = Status;
                        cmbStatus.DataValueField = "StatusId";
                        cmbStatus.DataTextField = "Status";
                        cmbStatus.DataBind();
                        cmbStatus.SelectedValue = Query.StatusId.ToString(); 
                 }
           }
        }
     public static Control GetPostBackControl(Page page)
    {
        Control postbackControlInstance=null;
        string postbackControlName = page.Request.Params.Get("__EVENTTARGET");
        if (postbackControlName != null && postbackControlName != string.Empty)
        {
            postbackControlInstance = page.FindControl(postbackControlName);
        }
        else
        {
            for (int i = 0; i < page.Request.Form.Keys.Count; i++)
            {
                postbackControlInstance = page.FindControl(page.Request.Form.Keys[i]);
                if (postbackControlInstance is System.Web.UI.WebControls.Button)
                {
                    return postbackControlInstance;
                }
            }
        }
       return postbackControlInstance;
    }
   protected void XmlHttpPanel_ServiceRequest(object sender, RadXmlHttpPanelEventArgs e)
    {
        string val = e.Value;
        int projectId = Convert.ToInt32(val);
        projectid = projectId;
        Session["ProjectId"] = val;
      ***binding grids based on  projectid***
          var Status = (from type in objEntity.ProjectStatus select type).ToList();
         var Query = (from p in objEntity.Projects where p.ProjectId == projectId select p).First();
           cmbStatus.DataSource = Status;
           cmbStatus.DataValueField = "StatusId";
           cmbStatus.DataTextField = "Status";
           cmbStatus.DataBind();
           cmbStatus.SelectedValue = Query.StatusId.ToString();   
     }  
   protected void btnUpdate_Click(object sender, EventArgs e)
    {
        if (Session["ProjectId"] != null)
        {
            int ProjectId = Convert.ToInt32(Session["ProjectId"]);
            ProTrakEntities objEntity = new ProTrakEntities();
            Project objProject = (from p in objEntity.Projects where p.ProjectId == ProjectId select p).First();
            DateTime dueDate = Convert.ToDateTime(dtDuedate.DbSelectedDate.ToString());
            objProject.DueDate = dueDate;
            
            objProject.StatusId = Convert.ToInt32(cmbStatus.SelectedValue);
            objEntity.SaveChanges();    
            Session["Statusid"] = Convert.ToInt32(cmbStatus.SelectedValue);        
            Response.Redirect("Default.aspx");
        }
    }
 
I'm using "Response.Redirect("Default.aspx")" to display the updatedvalue of status.After updating when i click a combobox it displays popup,but when select the main grid row to display the details of another project,the popup not woking and combobox diplaying the previous project status.If i go fro any action the value of combobox not changing.but if i refresh the page it displays the popup and updating working fine if click anything again same problem no popup.So if want to update status each and every time i need to refresh but this is not the way.

Thanks and Regards,
Tirumalesh
                 
                  

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When i clicked the ProductsCombo or ItemsCombo these dropdown lists are hiding behind the stocksCombo control ,
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Regards
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 Here is the code

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