Topic: tiny mce popup javascript is blocking server side events in asp.net

When the user selects a value from the drop down1 list I call the SelectedIndexChanged event which retrieves the selected value and binds another dropdown2 based on the selection.

My issue is that when the page is loaded I can select the value in dropdown1,but the SelectedIndexChanged event does not fire. If I remove the reference in my head tag to "tiny_mce_popup.js" the event does fire.

Is there a workaround that would let me use tiny_mce_popup.js and still be able to postback to my server side code?