Using button for the trigger, after can't click the button
<p>Im using Button for some triggers, use the trigger but cant click, im remove the trigger, after  button work but page header not displayed
look ate this</p>

<p><a href="https://i.stack.imgur.com/6pzPV.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6pzPV.png" alt="enter image description here"></a></p>

<p><code>&lt;asp:ImageButton ID="btnOderhelp" runat="server" OnClick="btnOderhelp_Click" ForeColor="White" ToolTip="Help" Height="25px" ImageUrl="~/img/help.png" /&gt;</code></p>

<hr>

<pre><code>&lt;div class="col-md-12"&gt;
    &lt;div class="col-sm-2"&gt;
        &lt;asp:Label ID="Label2" runat="server" Text="Order No" Font-Bold="True" Font-Names="arial, helvetica, sans-serif" Font-Size="13px"&gt;&lt;/asp:Label&gt;
    &lt;/div&gt;
    &lt;div class="col-sm-3"&gt;
        &lt;asp:TextBox ID="txtoder" MaxLength="15" runat="server" CssClass="form-control" Width="348px" placeholder="Oder Placement No/Style Name"&gt;&lt;/asp:TextBox&gt;
        &lt;asp:HiddenField ID="hdnoder" runat="server"&gt;&lt;/asp:HiddenField&gt;
        &lt;asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ControlToValidate="txtoder" CssClass="error" ErrorMessage="RequiredFieldValidator" Display="Dynamic" ValidationGroup="save" Font-Size="11px" ForeColor="Red"&gt;Order No Required!&lt;/asp:RequiredFieldValidator&gt;
    &lt;/div&gt;
    &lt;div class="col-md-1" style="left: 30px;"&gt;
        &lt;asp:Label ID="Label8" runat="server" ForeColor="Red" Text="*"&gt;&lt;/asp:Label&gt;
        &lt;asp:ImageButton ID="btnOderhelp" runat="server" OnClick="btnOderhelp_Click" ForeColor="White" ToolTip="Help" Height="25px" ImageUrl="~/img/help.png" /&gt;
        ...
    &lt;/div&gt;
    ...
&lt;/div&gt;
</code></pre>

<p>I tried to use <code>&lt;asp:PostBackTrigger ControlID ="btnOderhelp" /&gt;</code> but it's not working for me, I can't click the button.</p>