A utility to open up temporary inspector windows to view objects. NewInspectorWindow.cs and InspectorButtonPropertyDrawer.cs should be inside an Editor folder.

InspectorButtonAttribute.cs

using UnityEngine;

public class InspectorButtonAttribute : PropertyAttribute { }

InspectorButtonPropertyDrawer.cs

using System;
using UnityEditor;
using UnityEngine;

[CustomPropertyDrawer(typeof(InspectorButtonAttribute))]
public class InspectorButtonPropertyDrawer : PropertyDrawer {
	public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) {
		EditorGUI.PropertyField(new Rect(position.x, position.y, position.width - 50f, position.height), property);

		if (GUI.Button(new Rect(position.width - 50f, position.y, 50f, position.height), "Inspect")) {
			NewInspectorWindow.InspectTarget(property.objectReferenceValue);
		}
	}
}

NewInspectorWindow.cs

using UnityEngine;
using UnityEditor;
using System.Collections;

public static class NewInspectorWindow {
	public static void InspectTarget(GameObject target)
	{
		System.Type inspectorType = typeof(Editor).Assembly.GetType("UnityEditor.InspectorWindow");
		EditorWindow inspectorInstance = ScriptableObject.CreateInstance(inspectorType) as EditorWindow;

		var p = inspectorInstance.position;
		Vector2 pos = GUIUtility.GUIToScreenPoint(Event.current.mousePosition);

		pos.x = pos.x - p.size.x * 0.5f;
		pos.y += 20f;
		p.position = pos;
		p.size = new Vector2(400f, 600f);

		inspectorInstance.ShowUtility();
		inspectorInstance.position = p;

		var prevSelection = Selection.activeObject;

		Selection.activeObject = target;
		var isLocked = inspectorType.GetProperty("isLocked", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public);
		isLocked.GetSetMethod().Invoke(inspectorInstance, new object[] { true });

		Selection.activeObject = prevSelection;
	}
}