C#

public class Vector3d {

public:

  float x, y, z;

  Vector3d() 
  {
  }
}

[NativeCppClass]
   [CLSCompliant(false)]
   public struct Vector3d
   {
   }

private void button2_Click(object sender, EventArgs e)
            {

	    // ToolStripMenuItem.Visible always returns false?
            // This has the effect of not being able to toggle or invert the state to false by
            // assigning its negated value by use of the ! operator.
            // If the initial state is Visible = false the first click will toggle to Visible = true
            // Subsequent clicks do not change the Visible property as Visible always returns false
            // So, no matter the true state it will always set Visible = true rather than the inverse;
            

            // always returns false even if set to Visible = True
            bool cond1 = this.confirmDeletesToolStripMenuItem.Visible; 

            // always returns true
            bool cond2 = !this.confirmDeletesToolStripMenuItem.Visible; 

            MessageBox.Show(string.Format("Cond1 = {0} Cond2 = {1}",cond1,cond2));

            // try to invert the value of confirmDeletesToolStripMenuItem.Visible 
            this.confirmDeletesToolStripMenuItem.Visible = !this.confirmDeletesToolStripMenuItem.Visible;

            // still always returns false
            cond1 = this.confirmDeletesToolStripMenuItem.Visible; 

            // still always returns true
            cond2 = !this.confirmDeletesToolStripMenuItem.Visible; 

            MessageBox.Show(string.Format("Cond1 = {0} Cond2 = {1}", cond1, cond2));

            
            }