ShellTreeViewBeforeShellCommand Event

public event EventHandler<BeforeShellCommandEventArgs> BeforeShellCommand

Public Event BeforeShellCommand As EventHandler(Of BeforeShellCommandEventArgs)

public:
 event EventHandler<BeforeShellCommandEventArgs^>^ BeforeShellCommand {
	void add (EventHandler<BeforeShellCommandEventArgs^>^ value);
	void remove (EventHandler<BeforeShellCommandEventArgs^>^ value);
}

member BeforeShellCommand : IEvent<EventHandler<BeforeShellCommandEventArgs>,
    BeforeShellCommandEventArgs>

using (ShellBrowser shellBrowser = new ShellBrowser(lFilePath))
{
    //The following code shows some variants to stop a context menu item from being executed.
    shellBrowser.BeforeShellCommand += (s, e) =>
    {
        if (e.Verb == ShellCommand.Open)
            e.Cancel = true;
        //this is equivalent to:
        if (e.Verb == ShellContextMenuCommand.Open)
            e.Cancel = true;
        //or
        if (ShellCommand.IsOpen(e.Verb))
            e.Cancel = true;

        //not all context menu commands have a "verb". If it is empty, then you can at least access the caption:
        if (ShellCommand.IsEmpty(e.Verb))
            System.Diagnostics.Debug.WriteLine(e.Verb.Caption);
    };
    shellBrowser.ShowContextMenu(Cursor.Position);
}