UI Datepicker close on update an option

UI Datepicker close on update an option

Hey,

add a selectbox to buttonPanel.
This selectbox calls a function "CheckRegionSelect" get's selectedIndex of selectbox and should update an own option in datepicker.

After that i have to call datepicker("show"), to get the datepicker again displayed. All Changes are done but why does the datepicker closes after Changing an Option?

Using Jquer v1.7.2 and UI 1.8.24. Update not possible atm.
  1. function CheckRegionSelect (selDatepicker) {
        state = parseInt($(selDatepicker).datepicker("widget").find('.RegionSelect').val());
        if (state > -1 && state != $(selDatepicker).datepicker("option", "regionState")) {
            $(selDatepicker).datepicker("option", "regionState", state);
            $(selDatepicker).datepicker("show");
        }
    }





Thanks

Charly