Option passed to a control to give it an absolute height.

Note: This option will override the Automatic height Layout parameter

Fixed Height for a GUI Control.

	// Draws a  button with a  fixed height
	function OnGUI() {
		GUILayout.Button("A Button with fixed height", GUILayout.Height(300));
	}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void OnGUI() {
        GUILayout.Button("A Button with fixed height", GUILayout.Height(300));
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def OnGUI() as void:
		GUILayout.Button('A Button with fixed height', GUILayout.Height(300))