how to show submit button when click on treeview in any node

Question

Hi frnds

how to show submit button when click on treeview in any node .

i have treeview with buttons . i hide button submit on page load ,which i showed in below code .

here i want if i click on ant node or subnode submit button should be display or enable so how to do this ?

<div id="CheckBoxList1">

<asp:Label ID="lbl" runat="server" Text= "send"></asp:Label>

<br />

<asp:TreeView ID="TreeView1" runat="server" ShowExpandCollapse="false" Checked="false"></asp:TreeView>

</div>

<br />

<br />

<div id="div1">

<asp:Button ID="btnSubmit" Style="display: none" runat="server" Text="Send" CssClass="btn btn-primary" />

<asp:Button ID="btnBack" runat="server" Text="Back" CssClass="btn btn-primary" ToolTip="Click To Back" />

</div>