Hello Jimmy,
One way to work with this would be to handle the ErrorShowing event for the combo. In there, check the dialog state to see if it is anything but closed. If it is then return false to cancel the event, preventing the error message from showing in that instance.
function ErrorShowing(evt, ui) {
var dialogState = $('#dialog').igDialog('option', 'state');
if (dialogState != 'closed') {
return false;
}
}
I've attached the sample I used to verify this approach works so that you can see how this can be implemented.