I have a selectcontent display in a solr search grid (SelectCourse of a solr search on course with courseParts as column)

When editing course parts, the edit button is disabled for all cells.
As soon as I change a course part combo box value (adding or removing a course part) the edit button becomes available for all cells.

See video capture.

In SelectContent, the edition button is created in disabled mode.
Only a "combobox" change event could enable it

_onComboBoxChange: function()
    {
        if (this.editionButton)
        {
            var finalValue = this.getValue();
            this.editionButton.setDisabled(!finalValue || this.multiple && finalValue.length == 0)
        }
    }

But why it becomes available for all whereas I changed only one combobox ?