I cant use UI and 3D object touch

Hello
I attached my problem on a picture, please help me. I used ui sprite pedal object with event trigger componenet and working perfect. also I will use 3d cube event trigger but not work. I used onmousedown or raycast metotds but I need when player pressing ui button during can touch 3d cube object.

I hope you understand, my english not good :frowning:

void OnMouseDown()
{
Do something.
}
is used for pressing 3D model.