Hi Bob,

This issue happen because the parent WebCombo value was null on load and focus on other row, thus current WebCombo show this alert message. For a work around, you could set parent WebCombo value when entering current WebCombo edit mode (WebGrid's OnEnterEditMode client side event) as the following:

function EnterEditMode(controlId, tableName, editObject){    var cell = editObject.ToCellObject();
    if (editObject.type == "WebComboNET")
    {
        var webCombo = editObject.element;
        if (webCombo.LinkSettings.Enabled && webCombo.LinkSettings.ParentWebCombo && webCombo.LinkSettings.ParentWebCombo.length > 0)
        {
            var parentWebCombo = webCombo.LinkSettings.ParentWebCombo[0];
            if (!parentWebCombo.Value)
            {
                var parentValue = cell.Row.GetCell(parentWebCombo.Index).Value;
                parentWebCombo.SetValue(parentValue);
            }
        }
    }
}

As a reference, I have include the modified WebForm1.aspx on attachment.

Best Regards,
Leo

Thank you, that worked very well!

Hi Bob,

I am glad to hear that your problem sloved. Should you need further assistance or run into any problems in regard to our controls, feel free to post it into our forum. we would be happy to assist you again.

Best Regards,
Leo