jQuery Grid Plugin - jqGrid

Hallo Everyone,

I have a jqgrid, and in the page there are also several other fields, the request is to one filed has to be validated when i click on "Add" button in the jqgrid.

if the validation fails then the add modal dialog should not be displayed.

I wrote the validation function in beforeShowForm event for the "Add" button.

but I can not find any way to stop the add popup dilaog from displaying even after the validation falied.

Below is the partial code with which I have tried

.navGrid("#pager",

...

{closeAfterAdd: true, beforeShowForm: beforeShowFormEventForAdd, jqModal: false, width: 400, afterSubmit: afterSubmitEvent, editData: { Ext_MAC: Ext_MAC} },  //add

...);

function beforeShowFormEventForAdd(formid) {
    // Validate BAN and Zip code field when a femto device is about to be added, femto device depends on existing and correctly formatted Zip and BAN
    if (checkBANAndZipFileds()) { //Add Dialog will appear only if the BAN and Zip fields are in correct format
        beforeShowFormEvent(formid);
        MakeSerialNumberOnAddClick(formid);
    }
    else
        //$(formid).css("display","none !important"); did not work; displayed the whole dialog with all editable columns

        $(formid).hide(); // partially worked; displayed only the title caption and the submit, cancel button, rest of the form was hidden.
}

so, please help me guys with this, i need to completely stop dispalying the add popup dilaog if the validation fails.

Thanks in Advance...