DropDownOpened event in DataFormComboBoxField

[form]

Good day, I can not find event  DropDownOpened in DataFormComboBoxField.

How to track opening?

[Stefan]

Hello,

Indeed, DataFormComboBoxField does not expose such event. As a workaround I can suggest you the following approach. Subscribe, for example to the LayoutUpdated event of DataFormComboBoxField, and get the editor of DataFormComboBoxField, which is RadComboBox control. Then you can subscribe to its DropDownOpen or DropDownClosed events as suggested below:

private bool hasSubscribed;

private void DataFormComboBoxField_LayoutUpdated(object sender, EventArgs e)
{
    var combo = this.dataForm.
        ChildrenOfType<RadComboBox>().FirstOrDefault();
    if (combo != null && !hasSubscribed)
    {
        combo.DropDownOpened += combo_DropDownOpened;
        combo.DropDownClosed += combo_DropDownClosed;
        hasSubscribed = true;
    }
}

Note, that I have added a flag for the subscription, since LayoutUpdated would be raised multiple times.

Hope this helps.

Best Regards,
Stefan
Telerik

[form]

Yes, thank.