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AsyncPostBackTrigger for Checkbox control not firing

Context of the problem:
I have a checkbox and a button. The button is disabled and colored grey upon the page load. I want the checkbox to enable and re-color the button if checked, and revert the change if unchecked. Think of it as a User Agreement page, where the user accepts the terms and needs to click on the checkbox to proceed.
There is a grid view and other components above the page that would break upon a postback, so searching online I found that I could use an UpdatePanel. Thought this would be more simple than writing jQuery for the checkbox, but it isn't working
Code:
ASPX
<asp:UpdatePanel ID ="upCheckbox" runat="server">
<ContentTemplate>
<asp:CheckBox ID="checkLabel" runat="server" OnCheckedChanged="checkLabel_CheckedChanged"/><asp:Label ID="AknowledgementLabel" runat="server" Text="Info is correct & Enable button"></asp:Label>
<br /><br />
<asp:Button ID="btnSubmit" Text="Submit Application" CssClass="jqbutton" OnClick="btnSubmit_Click" runat="server"/>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="checkLabel" EventName="CheckedChanged"/>
</Triggers>
</asp:UpdatePanel>
Code Behind:
protected void Page_Load(object sender, EventArgs e)
{
btnSubmit.Enabled = false;
btnSubmit.ForeColor = System.Drawing.Color.Gray;
}
protected void checkLabel_CheckedChanged(object sender, EventArgs e)
{
if (checkLabel.Checked)
{
btnSubmit.Enabled = true;
btnSubmit.ForeColor = System.Drawing.ColorTranslator.FromHtml("#336699");
}
else
{
btnSubmit.Enabled = false;
btnSubmit.ForeColor = System.Drawing.Color.Gray;
}
}
Problem:
The checkbox does not work and the submit button remains disabled. Not sure if I am using Update Panels for the appropriate purpose or if am missing something. Is it possible to accomplish this the way that I am trying to, or should I move on to jQuery?

You are missing AutoPostback="true" in your CheckBox control. By default it is set to false. With autopostback missing your event won't reach server side.
<asp:UpdatePanel ID ="upCheckbox" runat="server">
<ContentTemplate>
<asp:CheckBox ID="checkLabel" runat="server" AutoPostback="true" OnCheckedChanged="checkLabel_CheckedChanged"/>
<asp:Label ID="AknowledgementLabel" runat="server" Text="Info is correct & Enable button"></asp:Label>
<br /><br />
<asp:Button ID="btnSubmit" Text="Submit Application" CssClass="jqbutton" OnClick="btnSubmit_Click" runat="server"/>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="checkLabel" EventName="CheckedChanged"/>
</Triggers>
</asp:UpdatePanel>

Dropdown not Updating lbl in Updatepanel

Situation:
Checkbox inside a updatepanel
multiline textbox inside a different updatepanel.
if the user checks the checkbox, the multiline text box gets a name... this works fine.
HTML:
<asp:UpdatePanel ID="upTraveling" runat="server"
UpdateMode="Conditional" ChildrenAsTriggers="False">
<ContentTemplate>
<asp:CheckBox ID="cbRUTraveler" runat="server" Text="I am a Traveler" AutoPostBack="True"
oncheckedchanged="cbRUTraveler_CheckedChanged1" />
</ContentTemplate>
</asp:UpdatePanel>
<td>
<asp:UpdatePanel ID="upTravelers" runat="server" ondatabinding="cbRUTraveler_CheckedChanged1"
UpdateMode="Conditional">
<ContentTemplate>
<asp:TextBox ID="tbTravelers"
Class="textwidth" runat="server" TextMode="MultiLine"
placeholder="FName LName, FName LName" required="required">
</asp:TextBox>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger
ControlID="cbRUTraveler" EventName="CheckedChanged" />
</Triggers>
</asp:UpdatePanel>
C#:
protected void cbRUTraveler_CheckedChanged1(object sender, EventArgs e)
{
tbTravelers.Text =
RequesterBPL.RequesterTraveling(cbRUTraveler.Checked, tbTravelers.Text);
going = cbRUTraveler.Checked;
}
I also have 2 other updatepanels on the same page... a dropdown list in one updatepanel and a label in another updatepanel. When a user selects a value in the dropdown list... it's suppose to trigger a name placement in the label.
HTML:
<td>
<asp:UpdatePanel ID="upManager" runat="server"
ondatabinding="ddlTeam_SelectedIndexChanged"
UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="ddlTeam"
EventName="SelectedIndexChanged" />
</Triggers>
<ContentTemplate>
<asp:Label ID="lblManager" runat="server" > </asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
</td>
C#:
protected void ddlTeam_SelectedIndexChanged(object sender, EventArgs e)
{
//upManager.Update();
lblManager.Text =
ManagerBPL.ReturnManagerName(ddlTeam.SelectedIndex);
}
However, when a user makes a selection in the dropdown, nothing happens.
until the user checks the checkbox which has nothing to do with the label and the dropdown. Once the user checks (or unchecks) the checkbox... the label gets populated with the selection from the dropdown.
All controls are in a table for structure. I have the scriptmanager in place.
From what I've been reading on the net this maybe a bug... If not a bug does anyone see where I may be going wrong...?
Thanks

Honestly you could do this all Client-Side. A simple example:
$(function () {
$('#<%= drpContent.ClientID %>').blur(function () {
var content = $('#<%= drpContent.ClientID %> option:selected').val();
$('#lblContent').text(content);
}
});
I've provided the initial example with the value declared. The second example is with a text representation.
$(function () {
$('#<%= drpContent.ClientID %>').blur(function () {
var content = $('#<%= drpContent.ClientID %> option:selected').text();
$('#lblContent').text(content);
}
});
An example with a Fiddle. The example though is simple, is far easier then dealing with an Update Panel. That particular control can be a nightmare to deal with, it can be quite painful. Though you asked about the server issue, this option is more viable and more common.
Update Panel (Drawback):
Creates pandomonium between Client / Server Side Events.
Stores your entire page in memory, then recreates (Performance Heavy)
Often breaks Page-State quickly in the Asp.Net Page Life Cycle.
Hopefully this helps.

How to active AsyncPostBackTrigger in Update Panel?

I created a updatePanel, is include some dropdownlist and a few button and I use AsyncPostBackTrigger for not update all page when the click button or select dropdownlist.
My page structure that an aspx page and also use user control page. I use updatePanel on UserControlPage.
Here is My code and I wish you help me:
<asp:UpdatePanel ID="UpdMonthly" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:DropDownList ID="ddlSenetIslemleriAlinanUrun1" AutoPostBack="true" OnSelectedIndexChanged="ddlSenetIslemleriAlinanUrun1_SelectedIndexChanged" runat="server"></asp:DropDownList>
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
<asp:Button ID="btnKaydet" style="margin:10px ;" Width="100" Height="50" runat="server" Text="Kaydet" OnClick="btnKaydet_Click"/>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="ddlSenetIslemleriAlinanUrun1" EventName="Click" />
<asp:AsyncPostBackTrigger ControlID="btnKaydet" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
I have some knowledge on placeholder but when the click dropdown or button, page is postback and placeholder knowledge dissappear.
how to fix postback problem?
Thanks for your answers.

button OnClick event doesn't fire at the first time in UpdatePanel

I have an issue on button OnClick event.
There is a refresh button in a user control ("header") which will refresh a place holder ("phContent") that generates some other user controls at run time. However, the button OnClick event doesn't fire until the whole place holder content loads.
Page.aspx
<ext:ContentHeader ID="header" runat="server" Visible="false" />
<asp:UpdatePanel ID="upControl" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="false">
<ContentTemplate>
<asp:PlaceHolder ID="phContent" runat="server"></asp:PlaceHolder>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="header" EventName="OnFormSubmit" />
</Triggers>
</asp:UpdatePanel>
UserControl.ascx
<div>
<asp:Button ID="btnRefresh" runat="server" Text="Refresh" OnClick="btnRefresh_OnClick" />
</div>
UserControl.cs
protected void btnRefresh_OnClick(object sender, EventArgs e)
{
//some code
OnFormSubmit(this, e);
}
public delegate void UserControlFormSubmit(object sender, EventArgs e);
public event UserControlFormSubmit OnFormSubmit;

Not sure what exactly the page and source code is.
But from front-end, take for jQuery as example.
You can try something like:
jQuery(function(){
jQuery('#btnRefresh').on('click',function(){
//load the content by ajax
jQuery('#phContent').load('#chart');
});
});

You have to place the button in updatepanel as well.
<ext:ContentHeader ID="header" runat="server" Visible="false" />
<asp:UpdatePanel ID="upControl" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="false">
<ContentTemplate>
<asp:Button ID="btnRefresh" runat="server" Text="Refresh" OnClick="btnRefresh_OnClick" />
</ContentTemplate>
</asp:UpdatePanel>

Not able to enable Panel which is outside the update panel from the update panel in asp.net

Here is the scenario,
I have one update panel in which I have radio button.
On check of radio button I want to enable Panel which is outside the update panel.
I have tried following 2 things:
Placing the panel in another update panel didn't work.
Using JavaScript on click of radio button didn't work.

placing the panel in another updatepanel and set update mode as conditional.
You need to do one more thing
On check of radio button event you need to call update method of newly added update panel
UpdatePanel1.Update();

I hope this code sample helps you.
<asp:UpdatePanel ID="udp1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:RadioButton ID="rb1" runat="server" AutoPostBack="true" OnCheckedChanged="Control_CheckedChanged"
Text="Text" GroupName="Group1" />
<asp:RadioButton ID="rb2" runat="server" AutoPostBack="true" OnCheckedChanged="Control_CheckedChanged"
Text="Text2" GroupName="Group1" />
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="udp2" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Panel ID="pnl1" runat="server" Visible="false">
<asp:Label ID="lblText" runat="server" Text="Text"/>
</asp:Panel>
</ContentTemplate>
<asp:AsyncPostBackTrigger ControlID="rb1" />
<asp:AsyncPostBackTrigger ControlID="rb2" />
</asp:UpdatePanel>
protected void Control_CheckedChanged(object source, EventArgs e)
{
pnl1.Visible=rb1.Checked;
}