reset Workspace with initial XML-Block

src/components/Blockly/BlocklyWindow.js

@@ -7,6 +7,7 @@ import BlocklyComponent from './';
 import * as Blockly from 'blockly/core';
 import './blocks/index';
 import './generator/index';
+import { initialXml } from './initialXml.js';
 
 
 
@@ -53,8 +54,7 @@ class BlocklyWindow extends Component {
           drag: true,
           wheel: false
         }}
-        initialXml={`<xml xmlns="https://developers.google.com/blockly/xml">
-          <block type="arduino_functions" id="QWW|$jB8+*EL;}|#uA" x="27" y="16"></block></xml>`}
+        initialXml={initialXml}
       >
 
       </BlocklyComponent >

src/components/Blockly/initialXml.js

@@ -0,0 +1,3 @@
+export const initialXml = `<xml xmlns="https://developers.google.com/blockly/xml">
+  <block type="arduino_functions" deletable="false" id="QWW|$jB8+*EL;}|#uA" x="27" y="16"></block></xml>`
+// Block is initial Block of the workspace and must always be a part of the workspace

src/components/Blockly/toolbox/Toolbox.js

@@ -286,12 +286,15 @@ class Toolbox extends React.Component {
                         </Value>
                     </Block>
                 </Category>
+                {/* this block is the initial block of the workspace; not necessary
+                    to display, because it can only be used once anyway
                 <Category name="Procedures" colour={getColour().procedures}>
                     <Block type="arduino_functions" />
                 </Category>
+                */}
             </xml>
         );
     };
 }
 
-export default Toolbox;
+export default Toolbox;