Checkbox to all the header columns in radgrid

Question

I am trying to add checkbox to all the header columns and get the checked value on Button Click,

how to do when the AutoGenerateColumns="True".  Pls suggest programmatically or Clientside.

 

Note: CheckBoxChecked event is not required since I've to do the functionality at the button click on checked/unchecked checkboxes.

 

 

<telerik:RadGrid ID="Gridview" runat="server" AllowMultiRowEdit="true" AllowSorting="True" AutoGenerateColumns="true" Skin="<%$ appSettings:Skin %>" EnableEmbeddedSkins="False" Width="95%" CellSpacing="0" GridLines="None" CssClass="liquidItem" AllowPaging="True" PagerStyle-AlwaysVisible="true" PageSize="25" >