C# WinForms: I can not override OnNodeMouseDoubleClick event for a TreeView

I created a new object which inherits from the TreeView I created in the designer.  In the C#, I:

- hide that TreeView
- I construct a new TreeView based on the child class
- assign the value to it from the designer TreeView, to save work for myself
- I show the new TreeView and add it to the Controls list for the form


But, when I double click a collapsed node it expands the node before hitting the breakpoint in my overriden function:

        protected override void OnNodeMouseDoubleClick(TreeNodeMouseClickEventArgs e)
        {
        base.OnNodeMouseDoubleClick(e);
        }

I want to stop the collpase expand behavior and get that under my control, so I can only expand/collapse when I choose to.

What am I doing wrong?