Edit dynamic created elements

Edit dynamic created elements

Hi!
I create tablerows and cells dynimaic dependent on a ajax-request. Now i want to add droppable attribut to it with a plugin. I can manek the plugin work if i use static HTML, but my dynimic created elements seems to not be able to edit.
All elements get class="drop" and even the easy code like $(".drop").hide(); does not effect my dynamic elements.

Code for creation:
$.getJSON("/Schedule/GetTeachersList", null, function(data) {
$.each(data, function(index, optionData) {
$("table").append("<tr><td class=\"nodrop\">" + optionData.Name + "</td></tr>");
});
for (a = 0; a < 60; a++) {
$("tr").append("<td class=\"drop\">" + a + "</td>");
}
});

someone have an idea?