C# - Dynamic Link Button Not Doing Anything On Click

I'm trying to fix a problem with some code (not written by me)

lnkbtnPageNumber.ID = "PageNumberCustomerRef" + intPageNumber.ToString();
lnkbtnPageNumber.Command += new CommandEventHandler(lnkbtnPageNumber_Command);
lnkbtnPageNumber.CommandName = "DepotRef";
lnkbtnPageNumber.CommandArgument = intPageNumber.ToString();
lnkbtnPageNumber.Text = intPageNumber.ToString().PadLeft(3, '0');
lnkbtnPageNumber.Attributes.Add("style", "margin: 2px;");
pDepotRefPages.Controls.Add(lnkbtnPageNumber);
This code creates a link button, however when I click on the button on the page. The function lnkbtnPageNumber_Command is not being called. The scripts just not getting to it.
I've tried google but everywhere I've looked says that this code should work fine.
Here is the code which is being called by the function:
void lnkbtnPageNumber_Command(object sender, CommandEventArgs e)
{
try
{
switch (e.CommandName)
{
case "GlobalID":
gintDocketNumberPage = Convert.ToInt32(e.CommandArgument);
break;
case "CreatedDate":
gintCreationDatePage = Convert.ToInt32(e.CommandArgument);
break;
case "Accounts":
gintAccountPage = Convert.ToInt32(e.CommandArgument);
break;
case "CustomerRef":
gintCustomerRef = Convert.ToInt32(e.CommandArgument);
break;
case "DepotRef":
gintDepotRef = Convert.ToInt32(e.CommandArgument);
break;
default:
gintDocketNumberPage = Convert.ToInt32(e.CommandArgument);
break;
}

I've just read somewhere that this code won't work unless called from Page_Init which if true is a but of a pain cos I can't put this fuction in Page_Init...