src/Misc/EFTools/DesignXmlCore/VirtualTreeGrid/DropDownControl.cs
/// <summary>
///     Notify derived classes that the drop-down is opening
/// </summary>
Notify derived classes that the drop-down is opening
Notify derived classes that the drop - down is opening
protected virtual void OnOpeningDropDown(EventArgs e)
        {
            if (OpeningDropDown != null)
            {
                OpeningDropDown(this, EventArgs.Empty);
            }
        }
protected virtual void OnOpeningDropDown ( EventArgs e ) { if ( OpeningDropDown != null ) { OpeningDropDown ( this , EventArgs . Empty ) ; } }
Notify derived classes that the drop-down is opening
Notify derived classes that the drop - down is opening
// inform listeners that the drop-down is about to open
e
EventArgs