Create Demo MPart using EModelService

That way the MPart has access to the context and is autoattached to it.
It is done manually after creation here thus this is more of a safety
net in case the model specifies smth that is not done manually here.

Author: akurtakov

chemclipse/plugins/org.eclipse.chemclipse.ux.extension.ui/src/org/eclipse/chemclipse/ux/extension/ui/views/DemoWelcomeTile.java

@@ -32,7 +32,6 @@
 import org.eclipse.chemclipse.ux.extension.ui.definitions.IWelcomeTileDefinition;
 import org.eclipse.e4.core.di.annotations.Execute;
 import org.eclipse.e4.ui.model.application.MApplication;
-import org.eclipse.e4.ui.model.application.ui.basic.MBasicFactory;
 import org.eclipse.e4.ui.model.application.ui.basic.MPart;
 import org.eclipse.e4.ui.model.application.ui.basic.MPartStack;
 import org.eclipse.e4.ui.workbench.modeling.EModelService;
@@ -72,7 +71,7 @@ public void handleEvent(EModelService modelService, MApplication application, EP
 
 					try {
 						if(chromatogramFile != null && chromatogramFile.exists()) {
-							MPart part = createChromatogramPart();
+							MPart part = createChromatogramPart(modelService);
 							part.setLabel("DemoChromatogram.ocb");
 							Map<String, Object> map = new HashMap<>();
 							map.put(EditorSupport.MAP_FILE, chromatogramFile.getAbsolutePath());
@@ -103,12 +102,12 @@ void showEditorPart(MPart part, EModelService modelService, MApplication applica
 		partService.showPart(part, PartState.ACTIVATE);
 	}
 
-	MPart createChromatogramPart() {
+	MPart createChromatogramPart(EModelService modelService) {
 
 		/*
 		 * Create the input part and prepare it.
 		 */
-		MPart part = MBasicFactory.INSTANCE.createPart();
+		MPart part = modelService.createModelElement(MPart.class);
 		part.setElementId("org.eclipse.chemclipse.ux.extension.xxd.ui.part.chromatogramEditorMSD");
 		part.setContributionURI("bundleclass://org.eclipse.chemclipse.ux.extension.xxd.ui/org.eclipse.chemclipse.ux.extension.xxd.ui.editors.ChromatogramEditorMSD");
 		part.setIconURI(ApplicationImageFactory.getInstance().getURI(IApplicationImage.IMAGE_CHROMATOGRAM, IApplicationImageProvider.SIZE_16x16));