Draw order of Texture2D vs DrawUserPrimitives

@MatX wrote:

I'm trying to use Texture2D objects and VertexPositionColor objects with DrawUserPrimitives at the same time in my draw calls, but my issue is that no matter in which order I call these, the Texture2D (blue square) is always on top. I can only really control the draw order between VertexPositionColor objects and Texture2D objects separately, but I can't do it when I mix them. Why? The SpriteSortMode has also no effect. Here's the sample code:
protected override void Draw(GameTime gameTime)
{
this.GraphicsDevice.Clear(Color.Transparent);
GraphicsDevice.BlendState = BlendState.Opaque;
GraphicsDevice.DepthStencilState = DepthStencilState.Default;
GraphicsDevice.SamplerStates[0] = SamplerState.LinearWrap;
_basicEffect = new BasicEffect(this.GraphicsDevice);
_basicEffect.World = Matrix.CreateTranslation(-this.GraphicsDevice.Viewport.Width / 2, -this.GraphicsDevice.Viewport.Height / 2, 0);
_basicEffect.View = Matrix.CreateLookAt(new Vector3(0, 0, -1), new Vector3(0, 0, 0), new Vector3(0, -1, 0));
_basicEffect.Projection = Matrix.CreateOrthographic((float)GraphicsDevice.Viewport.Width, (float)GraphicsDevice.Viewport.Height, 1.0f, 100.0f);
_basicEffect.VertexColorEnabled = true;
GraphicsDevice.RasterizerState = RasterizerState.CullClockwise;

    // setting up blue square
    var blueSquare = new Texture2D(this.GraphicsDevice, 100, 100);
    var blueColorData = new Color[100 * 100];
    for (int i = 0; i < 100; i++)
    {
        for (int j = 0; j < 100; j++)
        {
            blueColorData[i * 100 + j] = Color.Blue;
        }
    }

    blueSquare.SetData(blueColorData);

    // setting up red square
    VertexPositionColor[] redSquare = new VertexPositionColor[6];
    redSquare[0].Position = new Vector3(0, 0, 0f);
    redSquare[0].Color = Color.Red;
    redSquare[1].Position = new Vector3(0, 100, 0f);
    redSquare[1].Color = Color.Red;
    redSquare[2].Position = new Vector3(100f, 100f, 0f);
    redSquare[2].Color = Color.Red;
    redSquare[3].Position = new Vector3(100, 100f, 0f);
    redSquare[3].Color = Color.Red;
    redSquare[4].Position = new Vector3(100, 0f, 0f);
    redSquare[4].Color = Color.Red;
    redSquare[5].Position = new Vector3(0f, 0f, 0f);
    redSquare[5].Color = Color.Red;

    bool firstBlueThenRed = true;
    if (firstBlueThenRed)
    {
        var spriteBatch = new SpriteBatch(this.GraphicsDevice);
        spriteBatch.Begin();
        spriteBatch.Draw(blueSquare, new Vector2(50, 50), Color.White);
        foreach (EffectPass pass in _basicEffect.CurrentTechnique.Passes)
        {
            pass.Apply();
            this.GraphicsDevice.DrawUserPrimitives(PrimitiveType.TriangleList, redSquare, 0, 2);
        }

        // we put the "End" here because it flushes everything to the screen
        spriteBatch.End();
    }
    else
    {
        foreach (EffectPass pass in _basicEffect.CurrentTechnique.Passes)
        {
            pass.Apply();
            this.GraphicsDevice.DrawUserPrimitives(PrimitiveType.TriangleList, redSquare, 0, 2);
        }

        var spriteBatch = new SpriteBatch(this.GraphicsDevice);
        spriteBatch.Begin();
        spriteBatch.Draw(blueSquare, new Vector2(50, 50), Color.White);
        spriteBatch.End();
    }

    base.Draw(gameTime);
}`

So how can I achieve that the DrawUserPrimitives draws the red square on top of the blue one which is a texture in a sprite batch?

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