Button event wont fire?

 Hi!
This is my code:
 
 
public class Module_ManagePages
{
TableRow tr = new TableRow();
Button btnModuleName = new Button();
UpdatePanel pContentThis;
ScriptManager ScriptManager1This;
AsyncPostBackTrigger trigger = new AsyncPostBackTrigger();
Label testLabel = new Label();

public Module_ManagePages(UpdatePanel pContent, Table tableLeftMenu, ScriptManager ScriptManager1)
{
pContentThis = pContent;
ScriptManager1This = ScriptManager1;
tr.Controls.Add(createMenuItem());
tableLeftMenu.Controls.Add(tr);
}

private TableCell createMenuItem()
{
TableCell td = new TableCell();
Image imgCross = new Imag ...