Popup is auto hiding

Ai have a modal window. In modal window is attach a form and a toolbar.

On click on one button i show a popup attached to the form. The popup is showed but when the event function is over the popup is hide. what can i do to keep the popup showed ?

        modal_win=dhxWins.createWindow("modal", 0, 0, 580, 380);
        modal_win.center();
        modal_win.setModal(true);
        modal_win.setIcon('modify_s.png');
        t=modal_win.too=modal_win.attachToolbar();

        t.setIconSize(24);
        t.setIconPath('icons/')
        t.addButton('save',1,"Salveaza",'clean.png');
        t.addButton('cancel',1,"Renunta",'delete2.png');
        t.setAlign('right');
        t.attachEvent('onClick',function(id){
            if (id=='cancel') modal_win.close();
            if (id=='save') {
                modal_win.pop1.show('produs_existent');
                debugger;
                };

        })
        win_move_down_toolbar(modal_win)

        f=modal_win.form=modal_win.attachForm();
        f.loadStruct('php/load.php?op=new_com&santier='+id_santier+'&e='+nd(), "json");
        f.attachEvent("onChange", function (id, value){
            if (id=='produs_existent')
                f.setItemValue("um_exist",value.split('::')[1]);
        });

        p=modal_win.pop1 = new dhtmlXPopup({
            form: modal_win.form,
            id: ["produs_existent"]
        });
        p.attachHTML("Selectati un produs!!");


solved by commenting line d.hide() in function this._doOnClick = function in dhtmlxpopup.js. Please ignore the above problem