diff --git a/src/Components/Category/Category.tsx b/src/Components/Category/Category.tsx
new file mode 100644
index 0000000..1dfdd21
--- /dev/null
+++ b/src/Components/Category/Category.tsx
@@ -0,0 +1,60 @@
+import { ChevronRightIcon } from '@heroicons/react/outline';
+import React, { useState } from 'react';
+import { TruncateString } from '../../utils/stringtools';
+
+interface ICategoryProps {
+  children: JSX.Element | JSX.Element[]
+  category: string
+}
+
+export function Category(props: ICategoryProps): JSX.Element {
+  const [isOpen, setIsOpen] = useState(false);
+
+  if (isOpen) {
+    return (
+      <button type="button"
+        className='overflow-hidden h-full transition-all'
+        key={props.category}
+        id={props.category}
+        title={props.category}
+      >
+        <div
+          className='flex flex-row group full'
+          onClick={() => setIsOpen(!isOpen)}
+        >
+          <span className={'transition-all flex-1 h-full justify-center sidebar-component-left rounded-b-none bg-slate-400/60 group-hover:bg-blue-600'}>
+            {TruncateString(props.category, 25)}
+          </span>
+          <span className={'flex-none h-full justify-center sidebar-component-right rounded-b-none'}>
+            <ChevronRightIcon className='transition-all w-5 rotate-90' />
+          </span>
+        </div>
+        <div className='transition-all grid gap-2 p-2 bg-slate-400/60 overflow-auto rounded-b-lg visible'>
+          { props.children }
+        </div>
+      </button>
+    );
+  }
+
+  return (
+    <button type="button"
+      className='overflow-visible h-16 group transition-all'
+      key={props.category}
+      id={props.category}
+      title={props.category}
+      onClick={() => setIsOpen(!isOpen)}
+    >
+      <div className='flex flex-row h-full'>
+        <span className='flex-1 h-full justify-center sidebar-component-left'>
+          {TruncateString(props.category, 25)}
+        </span>
+        <span className='flex-none h-full justify-center sidebar-component-right'>
+          <ChevronRightIcon className='transition-all w-5' />
+        </span>
+      </div>
+      <div className='transition-all overflow-hidden rounded-b-lg hidden'>
+        { props.children }
+      </div>
+    </button>
+  );
+}
diff --git a/src/Components/Sidebar/Sidebar.tsx b/src/Components/Sidebar/Sidebar.tsx
index fa2bbbb..da22551 100644
--- a/src/Components/Sidebar/Sidebar.tsx
+++ b/src/Components/Sidebar/Sidebar.tsx
@@ -1,6 +1,8 @@
+import { ChevronRightIcon } from '@heroicons/react/outline';
 import * as React from 'react';
 import { IAvailableContainer } from '../../Interfaces/IAvailableContainer';
 import { TruncateString } from '../../utils/stringtools';
+import { Category } from '../Category/Category';
 
 interface ISidebarProps {
   componentOptions: IAvailableContainer[]
@@ -13,10 +15,16 @@ function HandleDragStart(event: React.DragEvent<HTMLButtonElement>): void {
 }
 
 export function Sidebar(props: ISidebarProps): JSX.Element {
-  const listElements = props.componentOptions.map(componentOption =>
-    componentOption.IsHidden !== true &&
-    <button type="button"
-      className='justify-center transition-all sidebar-component'
+  const rootElements: Array<JSX.Element | undefined> = [];
+  const categories = new Map<string, JSX.Element[]>();
+  // build the components
+  props.componentOptions.forEach(componentOption => {
+    if (componentOption.IsHidden === true) {
+      return;
+    }
+
+    const componentButton = (<button type="button"
+      className='w-full justify-center h-16 transition-all sidebar-component'
       key={componentOption.Type}
       id={componentOption.Type}
       title={componentOption.Type}
@@ -25,8 +33,33 @@ export function Sidebar(props: ISidebarProps): JSX.Element {
       onDragStart={(event) => HandleDragStart(event)}
     >
       {TruncateString(componentOption.Type, 25)}
-    </button>
-  );
+    </button>);
+    if (componentOption.Category === null || componentOption.Category === undefined) {
+      rootElements.push(componentButton);
+      return;
+    }
+
+    if (categories.get(componentOption.Category) === undefined) {
+      categories.set(componentOption.Category, []);
+    }
+
+    const category = categories.get(componentOption.Category);
+
+    if (category === undefined) {
+      // should never go here
+      return;
+    }
+
+    category.push(componentButton);
+  });
+
+  // build the categories
+  categories.forEach((options, category) => {
+    rootElements.unshift(
+      <Category category={category}>
+        { options }
+      </Category>);
+  });
 
   const isOpenClasses = props.isOpen ? 'left-16' : '-left-64';
   return (
@@ -38,7 +71,7 @@ export function Sidebar(props: ISidebarProps): JSX.Element {
       </div>
       <div className='grid grid-cols-1 md:grid-cols-1 gap-2
          m-2 md:text-xs font-bold'>
-        {listElements}
+        {rootElements}
       </div>
     </div>
   );
diff --git a/src/Interfaces/IAvailableContainer.ts b/src/Interfaces/IAvailableContainer.ts
index 0f6e36b..027f10c 100644
--- a/src/Interfaces/IAvailableContainer.ts
+++ b/src/Interfaces/IAvailableContainer.ts
@@ -10,6 +10,9 @@ export interface IAvailableContainer {
   /** type */
   Type: string
 
+  /** category */
+  Category?: string
+
   /** horizontal offset */
   X?: number
 
diff --git a/src/index.scss b/src/index.scss
index 988f4e1..58b95cd 100644
--- a/src/index.scss
+++ b/src/index.scss
@@ -11,6 +11,14 @@
     @apply transition-all px-2 py-6 text-sm rounded-lg bg-slate-300/60 hover:bg-blue-500 hover:text-slate-50
   }
 
+  .sidebar-component-left {
+    @apply transition-all px-2 py-6 text-sm rounded-l-lg bg-slate-300/60 group-hover:bg-blue-500 group-hover:text-slate-50
+  }
+
+  .sidebar-component-right {
+    @apply transition-all px-2 py-6 text-sm rounded-r-lg bg-slate-400/60 group-hover:bg-blue-600 group-hover:text-slate-50
+  }
+
   .sidebar-component-card {
     @apply transition-all overflow-hidden text-sm rounded-lg bg-slate-300/60 hover:bg-slate-300
   }
diff --git a/test-server/http.js b/test-server/http.js
index be800ae..3287382 100644
--- a/test-server/http.js
+++ b/test-server/http.js
@@ -65,6 +65,7 @@ const GetSVGLayoutConfiguration = () => {
         },
         ShowSelfDimensions: true,
         IsDimensionBorrower: true,
+        Category: "Category"
       },
       {
         Type: 'Trou',
@@ -82,7 +83,8 @@ const GetSVGLayoutConfiguration = () => {
           strokeWidth: 2,
           stroke: 'green',
           fill: 'white'
-        }
+        },
+        Category: "Category"
       },
       {
         Type: 'Remplissage',