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:
sender, EventArgs e)
var combo =
combo.DropDownOpened += combo_DropDownOpened;
combo.DropDownClosed += combo_DropDownClosed;
Note, that I have added a flag for the subscription, since LayoutUpdated would be raised multiple times.
Hope this helps.
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