If you would like to resize the EditingForm size you could set the EditingForm container height and/or width during OnEditingFormShow client side event handler. Here is the snippet:

function WebScheduler1_OnEditingFormShow(controlId, action, eventView, eventType, newType) {
    var s = ISGetObject(controlId);
    var editWindow = s.GetEditingFormWindow();

    s.EditingDialogBox.Height = "550px";
    s.EditingDialogBox.Width = "750px";
    
    return true;
}

The snippet will resize the EditingForm with a 750px width and 550px height.

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You could use the ExitEditMode client side event handler to fill in the ProductName cell. Here is the snippet:

function OrderDetails_WebGrid_OnExitEditMode(controlId, tblName, editObject)
{
    var wg = ISGetObject(controlId);

    var cellObj = editObject.ToCellObject();

    if (cellObj.Name == "ProductID_WebGridColumn")
    {
        if (editObject.element.IsInProgress)
        {
            editObject.ToCellObject().Select(true, true);
            return false;
        }
        else
        {
            if (editObject.element.GetSelectedRow() != null)
            {
                cellObj.GetRow().GetCell('ProductName_WebGridColumn').SetText(editObject.element.GetSelectedRow().cells[1].innerText);
                cellObj.GetRow().GetCell('ProductName_WebGridColumn').SetValue(editObject.element.GetSelectedRow().cells[1].innerText);
            }
        }
    }

    return true;
}

The IsInProgress conditional check is used if the WebCombo is still in the process of auto completing the inputed text.

Currently WebAqua will cause an error if we try to modify button collection during click event handler. A bug report has been submitted to the developer. We will inform you if there is any update or progress regarding this issue.

Thank your for the detailed report. I will pass this information to our developer for further analysis. We will inform you if there is any update or progress regarding this issue.