Hello Michael,

     Actually, we do have a client side event when the button is clicked. The workaround for this scenario is by creating a client side event of OnButtonClick then in side of it we can do show a WebDialogBox.

     Here is the snippet in order to do so:

        function WebFishEye1_OnButtonClick(controlId, button) {
            var WebFishEye1 = ISGetObject(controlId);
            var dlbBox = ISGetObject("WebDialogBox1");
            setTimeout(function() {
                if (button.ItemName == "btniTunes")
                    dlbBox.ShowDialog();
            }, 300);
            return true;
        }

      In this snippet, the dialogbox will show up when the button iTunes has been clicked. I hope it helps. Thank you and have a nice day.

Best Regards,

Andi Santoso