when event raised in slide the slide goes to unexpand

See more:

ASP.NET

jQuery

I created one slide show in my page I am using this code in .aspx
In jquery I am using this jquery function

$(document).ready(function () {
        $("#flip").click(function (e) {
            $("#hide").slideToggle("slow");
            e.preventDefault();
        });
    });

Here when I click button the slide is expanding down,

But, here my issue in slide box I created one drop down when the drop down event is fired the slide is goes to expounds to up.

I need solution like it should be expanding down only when drop down event is fired or any other events fired on the page.

This means when I click drop down button its going to the post back then immediately slide box goes up. How can I prevent this.

please share any idea to me.