@Override
protected TaskFeatureContainer createFeatureContainer(IFeatureProvider fp) {

	return new TaskFeatureContainer() {
		@Override
		public IAddFeature getAddFeature(IFeatureProvider fp) {
			return new AddTaskFeature(fp) {

				@Override
				protected void decorateShape(IAddContext context, ContainerShape containerShape,Task businessObject) {
					super.decorateShape(context, containerShape, businessObject);
					// my code goes here....
				}
			}
		}
}

	Shape shape = containerShape.getChildren().get(0);
		 GraphicsAlgorithm ga = shape.getGraphicsAlgorithm();
		Image img = CustomTaskImageProvider.createImage(customTaskDescriptor, ga,
					warning_image, 24, 24);
		Graphiti.getGaService().setLocationAndSize(img, 12, 12, 24, 24);

@Override
protected TaskFeatureContainer createFeatureContainer(IFeatureProvider fp) {

	return new TaskFeatureContainer() {

		@Override
		public IAddFeature getAddFeature(IFeatureProvider fp) {
			return new AddTaskFeature(fp) {

				@Override
				protected void decorateShape(IAddContext context, ContainerShape containerShape,
						Task businessObject) {
					super.decorateShape(context, containerShape, businessObject);
					setCustomStyle(containerShape);
				}
			};
		}

		@Override
		public ICreateFeature getCreateFeature(IFeatureProvider fp) {
			return new CreateTaskFeature(fp) {
			};
		}

		@Override
		public IUpdateFeature getUpdateFeature(IFeatureProvider fp) {
			MultiUpdateFeature multiUpdate = (MultiUpdateFeature) super.getUpdateFeature(fp);
			multiUpdate.addFeature(new AbstractUpdateBaseElementFeature<Task>(fp) {
				@Override
				public boolean update(IUpdateContext context) {
					// important to clear flag...
					setCustomStyle((ContainerShape) context.getPictogramElement());
					DIUtils.updateDIShape(context.getPictogramElement());
					return true;
				}

				@Override
				public IReason updateNeeded(IUpdateContext context) {

					IReason reason = super.updateNeeded(context);
					if (reason.toBoolean())
						return reason;

					PictogramElement pe = context.getPictogramElement();
					String propertyValue = FeatureSupport.getPropertyValue(pe, "evaluate.property");
					if (propertyValue == null || propertyValue.isEmpty()) {
						propertyValue = "false";
					}

					// Now evaluate the corresponding property of our
					// Business object
					Boolean attributeValue = false;
					BaseElement ta = (BaseElement) getBusinessObjectForPictogramElement(pe);
					Value valueUpdateACL = ImixsBPMNPlugin.getItemValueByName(ta, "keyUpdateACL", "xs:boolean",
							"false");
					if (valueUpdateACL.getValue() != null && valueUpdateACL.getValue().contains("true")) {
						attributeValue = true;
					}

					// update is needed if the property has changed....
					if (Boolean.parseBoolean(propertyValue) != attributeValue) {
						return Reason.createTrueReason("evaluate.property changed");
					}
					return Reason.createFalseReason("");
				}
			});

			return multiUpdate;
		}

		private void setCustomStyle(ContainerShape containerShape) {
			Task ta = BusinessObjectUtil.getFirstElementOfType(containerShape, Task.class);
			if (ta != null) {

				// evaluate ACL setting
				boolean bACLSetting = false;
				Value valueUpdateACL = ImixsBPMNPlugin.getItemValueByName(ta, "keyUpdateACL", "xs:boolean",
						"false");
				String propertyValue = valueUpdateACL.getValue();
				if (propertyValue != null && propertyValue.contains("true"))
					bACLSetting = true;

				// compute current width..
				int width = containerShape.getGraphicsAlgorithm().getWidth();
				Shape shape = containerShape.getChildren().get(0);

				// Add custoom Image
				GraphicsAlgorithm ga = shape.getGraphicsAlgorithm();
				if (bACLSetting) {
					Image img = loadCustomTaskIcon("inbox.png", ga);
					Graphiti.getGaService().setLocation(img, width-24, 2);
				}

				// set background color
				ShapeStyle shapeStyle = new ShapeStyle();
				if (bACLSetting)
					shapeStyle.setDefaultColors(PROCESSENTITY_BACKGROUND);
				else
					shapeStyle.setDefaultColors(PROCESSENTITY_BACKGROUND_ACL);

				StyleUtil.applyStyle(shape.getGraphicsAlgorithm(), ta, shapeStyle);

				// finally we update the new property value stored in the
				// pictorgramElement...
				FeatureSupport.setPropertyValue(containerShape, "evaluate.property", propertyValue);
			}
		}

	};
}

shape.getGraphicsAlgorithm().getGraphicsAlgorithmChildren().clear();

private void updateShapeStyle(ContainerShape containerShape) {
	Task ta = BusinessObjectUtil.getFirstElementOfType(containerShape, Task.class);
	if (ta != null) {
		
		// compute current width to place icons into the upper right corner..
		int width = containerShape.getGraphicsAlgorithm().getWidth();
		int xPos=width-20;

		PictogramElement pe = containerShape.getGraphicsAlgorithm().getPictogramElement();
		// compute the layoutStatus from the current businessObject..... 
		String newLayoutStatus = getNewLayoutStatus(pe, ta);
		// get the shape for the layout instructions....
		Shape shape = containerShape.getChildren().get(0);
		// first we clear all existing children of that shape...
		shape.getGraphicsAlgorithm().getGraphicsAlgorithmChildren().clear();		
		
		// set the background color
		ShapeStyle shapeStyle = new ShapeStyle();
		shapeStyle.setDefaultColors(PROCESSENTITY_BACKGROUND);
		
		// add the default image into the upper left corner....
		Image imga = loadCustomTaskIcon("process-bubble.png", shape.getGraphicsAlgorithm());
		Graphiti.getGaService().setLocationAndSize(imga, 2, 2, 24, 24);

		// Add 1. custom Image
		if (newLayoutStatus.contains("keyupdateacl=true")) {
			Image img = loadCustomTaskIcon("user_group.gif", shape.getGraphicsAlgorithm());
			Graphiti.getGaService().setLocation(img,xPos, 2);
			xPos=xPos-20;
		}

		// Add 2. custom Image
		if (newLayoutStatus.contains("txteditorid=")) {
			Image img = loadCustomTaskIcon("form.gif", shape.getGraphicsAlgorithm());
			Graphiti.getGaService().setLocation(img,xPos, 2);
		}

		StyleUtil.applyStyle(shape.getGraphicsAlgorithm(), ta, shapeStyle);

		// finally update the new property value which is verified in the updateNeeded() method
		System.out.println("set new layout status: ");
		FeatureSupport.setPropertyValue(containerShape, "layoutstatus.property", newLayoutStatus);
	}

}