Two ListBox Handlers Short Circuit Each Other

[Spare Change]

Given for a ListBox

this.HLinks.MouseDown += new System.Windows.Forms.MouseEventHandler
(this.HLinks_MouseDown);//

this.HLinks.SelectedIndexChanged += new
System.EventHandler(this.HLinks_SelectedIndexChang ed);

It seems I can have one but not the other.

If I use both, then the MouseDown event fires, when I change selection the
SelectedIndexChanged does not fire !

I use the MouseDown for a DragDrop event.

Sometimes I want to DragDrop from the ListBox to a TextBox; other times I
want to respond to a simple change in the selected Index of the TextBox via
a mouse click.

How ?
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