Grave Mod for Rimworld. Help pls :)

Building_Colonist_Grave.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;

using UnityEngine;
using RimWorld;
using Verse;

namespace Graves
{
    public class Building_Colonist_Grave : RimWorld.Building_Grave
    {
        private static Graphic cachedGraphicFull;
        private const string name = "Grave for Colonist";

        public override string Label
        {
            get
            {
                return name;
            }
        }

        private Graphic GraphicFull
        {
            get
            {
                if (Building_Colonist_Grave.cachedGraphicFull == null)
                    Building_Colonist_Grave.cachedGraphicFull = GraphicDatabase.Get<Graphic_Single>("Things/Building/Misc/GraveFull", ShaderDatabase.Cutout, this.def.size + IntVec2.two, Color.white);
                return Building_Colonist_Grave.cachedGraphicFull;
            }
        }

        public override Graphic Graphic
        {
            get
            {
                Thing storable = StoreUtility.GetStorable(this.Position);
                if (storable != null && storable is Corpse)
                {
                    return this.GraphicFull;
                }
                return this.def.graphic;
            }
        }

        public override void Notify_ReceivedThing(Thing newItem)
        {
            Find.MapDrawer.MapChanged(this.Position, MapChangeType.Things);
        }

        public override void Notify_LostThing(Thing newItem)
        {
            Find.MapDrawer.MapChanged(this.Position, MapChangeType.Things);
        }

        [DebuggerHidden]
        public override IEnumerable<IntVec3> AllSlotCells()
        {
            return base.AllSlotCells();
        }

    }
}

Building_Stranger_Grave.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;

using UnityEngine;
using RimWorld;
using Verse;

namespace Graves
{
    public class Building_Stranger_Grave : RimWorld.Building_Grave
    {
        private static Graphic cachedGraphicFull;
        private const string name = "Grave for Stranger";

        public override string Label
        {
            get
            {
                return name;
            }
        }

        private Graphic GraphicFull
        {
            get
            {
                if (Building_Stranger_Grave.cachedGraphicFull == null)
                    Building_Stranger_Grave.cachedGraphicFull = GraphicDatabase.Get<Graphic_Single>("Things/Building/Misc/GraveFull", ShaderDatabase.Cutout, this.def.size + IntVec2.two, Color.white);
                return Building_Stranger_Grave.cachedGraphicFull;
            }
        }

        public override Graphic Graphic
        {
            get
            {
                Thing storable = StoreUtility.GetStorable(this.Position);
                if (storable != null && storable is Corpse)
                {
                    return this.GraphicFull;
                }
                return this.def.graphic;
            }
        }

        public override void Notify_ReceivedThing(Thing newItem)
        {
            Find.MapDrawer.MapChanged(this.Position, MapChangeType.Things);
        }

        public override void Notify_LostThing(Thing newItem)
        {
            Find.MapDrawer.MapChanged(this.Position, MapChangeType.Things);
        }

        [DebuggerHidden]
        public override IEnumerable<IntVec3> AllSlotCells()
        {
            return base.AllSlotCells();
        }

    }
}

Buildings_Graves.xml

<?xml version="1.0" encoding="utf-8" ?>
<Buildings>


  <ThingDef Name="BuildingBase" Abstract="True">
    <category>Building</category>
    <soundImpactDefault>BulletImpactMetal</soundImpactDefault>
    <selectable>true</selectable>
    <drawerType>MapMeshAndRealTime</drawerType>
    <terrainAffordanceNeeded>Light</terrainAffordanceNeeded>
    <repairEffect>Repair</repairEffect>
    <leaveResourcesWhenKilled>true</leaveResourcesWhenKilled>
    <filthLeaving>BuildingRubble</filthLeaving>
  </ThingDef>
 
  <!-- Grave building definition -->
 
 <ThingDef ParentName="BuildingBase">
    <defName>Grave</defName>
    <eType>BuildingInert</eType>
    <label>Grave</label>
    <thingClass>Building_Grave</thingClass>
    <graphicPath>Things/Building/Misc/GraveEmpty</graphicPath>
    <graphicClass>Graphic_Single</graphicClass>
    <graphicOverdraw>true</graphicOverdraw>
    <constructEffect>ConstructDirt</constructEffect>
    <altitudeLayer>FloorEmplacement</altitudeLayer>
    <useStandardHealth>false</useStandardHealth>
    <description>Place the dead in graves to give them a decent final resting place.</description>
    <size>(1,2)</size>
    <statBases>
      <WorkToMake>650</WorkToMake>
    </statBases>
    <passability>Standable</passability>
    <building>
      <fixedStorageSettings>
        <allowances>
          <categories>
            <li>Corpses</li>
          </categories>
        </allowances>
      </fixedStorageSettings>
      <defaultStorageSettings>
        <priority>Important</priority>
        <allowances>
          <categories>
            <li>CorpsesHumanoid</li>
          </categories>
          <specialFiltersToAllow>
            <li>AllowBuried</li>
          </specialFiltersToAllow>
        </allowances>
      </defaultStorageSettings>
    </building>
    <inspectorTabs>
      <li>ITab_Storage</li>
    </inspectorTabs>
    <terrainAffordanceNeeded>Diggable</terrainAffordanceNeeded>
    <designationCategory>Misc</designationCategory>
    <itemSurface>true</itemSurface>
    <designationHotkey>G</designationHotkey>
  </ThingDef>
  
 <ThingDef ParentName="BuildingBase">
    <defName>ColonistGrave</defName>
    <eType>BuildingInert</eType>
    <label>Grave for Colonist</label>
    <thingClass>Graves.Building_Colonist_Grave</thingClass>
    <graphicPath>Things/Building/Misc/GraveEmpty</graphicPath>
    <graphicClass>Graphic_Single</graphicClass>
    <graphicOverdraw>true</graphicOverdraw>
    <constructEffect>ConstructDirt</constructEffect>
    <altitudeLayer>FloorEmplacement</altitudeLayer>
    <useStandardHealth>false</useStandardHealth>
    <description>Place the dead in graves to give them a decent final resting place. Preset for Colonists only</description>
    <size>(1,2)</size>
    <statBases>
      <WorkToMake>650</WorkToMake>
    </statBases>
    <passability>Standable</passability>
    <building>
      <fixedStorageSettings>
        <allowances>
          <categories>
            <li>Corpses</li>
          </categories>
        </allowances>
      </fixedStorageSettings>
      <defaultStorageSettings>
        <priority>Important</priority>
        <allowances>
          <categories>
            <li>CorpsesHumanoid</li>
          </categories>
          <specialFiltersToAllow>
            <li>AllowBuried</li>
          </specialFiltersToAllow>
		  <specialFiltersToDisallow>
		    <li>AllowCorpsesStranger</li>
		  </specialFiltersToDisallow>
        </allowances>
      </defaultStorageSettings>
    </building>
    <inspectorTabs>
      <li>ITab_Storage</li>
    </inspectorTabs>
    <terrainAffordanceNeeded>Diggable</terrainAffordanceNeeded>
    <designationCategory>Misc</designationCategory>
    <itemSurface>true</itemSurface>
	<designationHotkey>H</designationHotkey>
  </ThingDef>

  <ThingDef ParentName="BuildingBase">
    <defName>StrangerGrave</defName>
    <eType>BuildingInert</eType>
    <label>Grave for Stranger</label>
    <thingClass>Graves.Building_Stranger_Grave</thingClass>
    <graphicPath>Things/Building/Misc/GraveEmpty</graphicPath>
    <graphicClass>Graphic_Single</graphicClass>
    <graphicOverdraw>true</graphicOverdraw>
    <constructEffect>ConstructDirt</constructEffect>
    <altitudeLayer>FloorEmplacement</altitudeLayer>
    <useStandardHealth>false</useStandardHealth>
    <description>Place the dead in graves to give them a decent final resting place. Preset for Strangers only</description>
    <size>(1,2)</size>
    <statBases>
      <WorkToMake>650</WorkToMake>
    </statBases>
    <passability>Standable</passability>
    <building>
      <fixedStorageSettings>
        <allowances>
          <categories>
            <li>Corpses</li>
          </categories>
        </allowances>
      </fixedStorageSettings>
      <defaultStorageSettings>
        <priority>Important</priority>
        <allowances>
          <categories>
            <li>CorpsesHumanoid</li>
          </categories>
          <specialFiltersToAllow>
            <li>AllowBuried</li>
          </specialFiltersToAllow>
		  <specialFiltersToDisallow>
		    <li>AllowCorpsesColonist</li>
		  </specialFiltersToDisallow>
        </allowances>
      </defaultStorageSettings>
    </building>
    <inspectorTabs>
      <li>ITab_Storage</li>
    </inspectorTabs>
    <terrainAffordanceNeeded>Diggable</terrainAffordanceNeeded>
    <designationCategory>Misc</designationCategory>
    <itemSurface>true</itemSurface>
	<designationHotkey>J</designationHotkey>
  </ThingDef>
 </Buildings>

MapComponent_Graves.cs

using System;
using System.Collections.Generic;
using RimWorld;
using Verse;

namespace Graves
{
    class MapComponent_Graves : MapComponent
    {
        private int updateCounter = 0;
        private const int updateInterval = 500;

        public override void MapComponentOnGUI()
        {
            --this.updateCounter;
            if (this.updateCounter > 0)
                return;
            this.updateCounter = 250;
            List<Building> buildings = Find.ListerBuildings.allBuildingsColonist;

            foreach (Building current in buildings)
            {
                if (current.GetType() == typeof(Building_Grave)
                    || current.GetType() == typeof(Building_Mass_Grave)
                    || current.GetType() == typeof(Building_Colonist_Grave)
                    || current.GetType() == typeof(Building_Stranger_Grave))
                {
                    if (current.def != ThingDefOf.Grave)
                    {
                        current.def = ThingDefOf.Grave;
                    }
                }
            }
        }
    }
}