How to change ZWrite in transparency shaders

Hello, I am currently struggling with transparency shaders in Unity. I need to enable ZWrite On to get satisfying results but it seems to be disabled somewhere inside Lambert alpha shader and I have no idea where can I download or hw can i modify this shader. Changing ZWrite on in Alpha-Diffuse didn't change anything because I presume it's again changed somewhere inside this Lambert alpha shader. It's called like #pragma surface surf Lambert inside Alpha-Diffuse shader.