jQuery Grid Plugin - jqGrid

Hello!

I get the problem using multisearch and datepicker with showOn:'button'.

I have date type field and use datepicker for edit date-value.

colModel: [
                ...
                {

                   name: 'sbirthday',

                   index: 'birthday',

                   editable: true,

                   searchoptions: { dataInit: datePick, sopt: ['eq', 'ne', 'lt', 'le', 'gt', 'ge']} 

                },
                ...
                ],

$.datepicker.setDefaults({
    ...
    showOn: 'button',
    ...
});

datePick = function(elem) {
    jQuery(elem).datepicker();
}

When I click "search" - I get datepicker-button visible all time (not depends which field i choose for searching). When I click "+", I get one more  datepicker-button.

How can I resolve this issue? Please, help, i'm waiting your ideas!

Thank you