asp button within a modal does not trigger to click event

If you click on the button it makes me check the textbox , incorrect formats etc, but if the textbox are all validated it does not call the associated event, it Any idea ? the button is within a form with runat="server" that inherits from the master page .

<asp:Button ID="subPedido" runat="server" Text="Enviar" OnClick="SubPedido_Click" CssClass="buttonFloatRight"></asp:Button>

It works if it is out of the modal