I tried to capture the log output using Application.RegisterLogCallback but it did not work:

int logcalled ;

// Use this for initialization
void OnEnable() {
    UnityEngine.Application.RegisterLogCallback(new Application.LogCallback(MyCallback));
}

private void MyCallback(string condition, string stacktrace, UnityEngine.LogType type)
{
	logcalled++;
}

void OnGUI(){ 
	GUI.Label(new Rect(10,10,100,100), logcalled.ToString());

	if(GUI.Button(new Rect(100,100,100,100),"press"))
	{
		Debug.LogError("iada iada");
		Debug.Log("iada iada 2");
		object a = null;
		a.ToString();
	}
}

The above code dont work, the variable logcalled not incremented.

• Tried Debug.Log, Debug.LogError and a even a null exception, neither was captured, but they where all logged to the editor console.
• Tried to register the callback on "Start" with the same results.
• Tried a Debug.Log on the "Update" method, generating dozens of log msg/second. In this case 'logcalled' was called 2 times at the very begining and that was it.
• Tried using javascript instead of C#, didnt work either.

Am I missing something?

(question was edited to clarify it)