diff --git a/code/model/BlogPost.php b/code/model/BlogPost.php
index d1ce042..cc1921d 100644
--- a/code/model/BlogPost.php
+++ b/code/model/BlogPost.php
@@ -168,16 +168,20 @@ class BlogPost extends Page {
 			$options = BlogAdminSidebar::create(
 				$publishDate = DatetimeField::create("PublishDate", _t("BlogPost.PublishDate", "Publish Date")),
 				$urlSegment,
-				ListboxField::create(
-					"Categories",
-					_t("BlogPost.Categories", "Categories"),
-					$self->Parent()->Categories()->map()->toArray()
-				)->setMultiple(true),
-				ListboxField::create(
-					"Tags",
-					_t("BlogPost.Tags", "Tags"),
-					$self->Parent()->Tags()->map()->toArray()
-				)->setMultiple(true),
+				TagField::create(
+					'Categories',
+					_t('BlogPost.Categories', 'Categories'),
+					$self->Parent()->Categories()->map(),
+					$self->Categories()->map(),
+					!$this->canCreateCategories()
+				),
+				TagField::create(
+					'Tags',
+					_t('BlogPost.Tags', 'Tags'),
+					$self->Parent()->Tags()->map(),
+					$self->Tags()->map(),
+					!$this->canCreateTags()
+				),
 				$authorField,
 				$authorNames
 			)->setTitle('Post Options');
@@ -195,6 +199,48 @@ class BlogPost extends Page {
 		return $fields;
 	}
 
+	/**
+	 * Determine whether user can create new categories.
+	 *
+	 * @param int|Member|null $member
+	 *
+	 * @return bool
+	 */
+	public function canCreateCategories($member = null) {
+		$member = $member ?: Member::currentUser();
+		if(is_numeric($member)) $member = Member::get()->byID($member);
+
+		$parent = $this->Parent();
+
+		if(!$parent || !$parent->exists() || !($parent instanceof Blog)) return false;
+
+		if($parent->isEditor($member)) return true;
+
+		return Permission::checkMember($member, 'ADMIN');
+	}
+
+	/**
+	 * Determine whether user can create new tags.
+	 *
+	 * @param int|Member|null $member
+	 *
+	 * @return bool
+	 */
+	public function canCreateTags($member = null) {
+		$member = $member ?: Member::currentUser();
+		if(is_numeric($member)) $member = Member::get()->byID($member);
+
+		$parent = $this->Parent();
+
+		if(!$parent || !$parent->exists() || !($parent instanceof Blog)) return false;
+
+		if($parent->isEditor($member)) return true;
+
+		if($parent->isWriter($member)) return true;
+
+		return Permission::checkMember($member, 'ADMIN');
+	}
+
 	protected function onBeforeWrite() {
 		parent::onBeforeWrite();
 
@@ -220,7 +266,25 @@ class BlogPost extends Page {
 		}
 	}
 
+	/**
+	 * Sets blog relationship on all categories and tags assigned to this post.
+	 *
+	 * @throws ValidationException
+	 */
+	public function onAfterWrite()
+	{
+		parent::onAfterWrite();
 
+		foreach ($this->Categories() as $category) {
+			$category->BlogID = $this->ParentID;
+			$category->write();
+		}
+
+		foreach ($this->Tags() as $tag) {
+			$tag->BlogID = $this->ParentID;
+			$tag->write();
+		}
+	}
 
 	/**
 	 * Checks the publish date to see if the blog post has actually been published.
diff --git a/composer.json b/composer.json
index a3d50e3..7cb85b2 100755
--- a/composer.json
+++ b/composer.json
@@ -1,12 +1,17 @@
 {
-    "name": "silverstripe/blog",
-    "description": "A fresh take on blogging in Silverstripe set out to tackle the issue of a cluttered Site Tree.",
-    "keywords": ["silverstripe", "blog", "news"],
-    "type": "silverstripe-module",
-    "require": {
-        "silverstripe/cms": ">=3.1.0",
-	    "silverstripe/lumberjack": "~1.1"
-    },
+	"name": "silverstripe/blog",
+	"description": "A fresh take on blogging in Silverstripe set out to tackle the issue of a cluttered Site Tree.",
+	"keywords": [
+		"silverstripe",
+		"blog",
+		"news"
+	],
+	"type": "silverstripe-module",
+	"require": {
+		"silverstripe/cms": ">=3.1.0",
+		"silverstripe/lumberjack": "~1.1",
+		"silverstripe/tagfield": "dev-develop"
+	},
 	"require-dev": {
 		"phpunit/PHPUnit": "~3.7@stable"
 	},
@@ -15,15 +20,15 @@
 			"dev-master": "2.0.x-dev"
 		}
 	},
-    "license": "BSD-2-Clause",
-    "authors": [
-        {
-            "name": "Michael Strong",
-            "email": "github@michaelstrong.co.uk"
-        }
-    ],
-    "suggest": {
-        "silverstripe/widgets": "Some widgets come with the blog which are compatible with the widgets module.",
-        "silverstripe/comments": "This module adds comments to your blog."
-    }
+	"license": "BSD-2-Clause",
+	"authors": [
+		{
+			"name": "Michael Strong",
+			"email": "github@michaelstrong.co.uk"
+		}
+	],
+	"suggest": {
+		"silverstripe/widgets": "Some widgets come with the blog which are compatible with the widgets module.",
+		"silverstripe/comments": "This module adds comments to your blog."
+	}
 }