# Customise the CMC
You can customise the view you see of a particular server component in two ways: by defining additional MBeans to a server component that you are monitoring, or by adding a custom tab to the console’s display.
## Adding an MBean
An _MBean_ is a Java class that follows certain rules. It is added to the server component that hosts the object it describes, and is then registered with an _MBeanServer_. As well as a name, each MBean can have _attributes_ and _operations_, and can fire off _notifications_ when its values change.
To add a new MBean, you would write some Java code to describe the management interface required, and register its name with the MBeanServer. The following example defines an MBean called `ExampleMBean`, with a `QueueLength` attribute.
```java
public interface ExampleMBean {
int getQueueLength();
void setQueueLength( int queueLength );
}
public class Example implements ExampleMBean {
private int queueLength = 1024;
public synchronized int getQueueLength() {
return queueLength;
}
public synchronized void setQueueLength( int queueLength ) {
this.queueLength = queueLength;
}
}
public class Main {
public static void main( String[] args ) throws Exception {
DataSource datasource = DataSourceFactory.createDataSource(args);
Example mBean = new Example();
ObjectName name = new ObjectName("javadatasrc.server.demo:type=ExampleMBean");
datasource.getMBeanServer().registerMBean(mBean, name);
}
}
```
Having done this, you’ll need to add the following line to the server component’s XML config file, in order to enable JMX on that server, so that it can be monitored via CMC:
```
```
## Adding new tab to the CMC
Each tab displayed on the CMC is defined in two places. The content and structure is described in an XML file, while the functionality is defined by creating a Java Swing _JPanel_ component that implements the `View` interface.
The tabs to be displayed in the console are defined in XML, like so:
```xml
```
Each `` then has a separate XML file to describe its content, as well as to identify the Java class that defines its functionality, the location of the help file for that tab, and the location of any graphic to be used as an icon for the tab. The XML would look something like this:
```xml
com.caplin.view.explorer.ExplorerView
Explorer
Generic JMX Explorer View
explorer.tab
/conf/folder_view.png
```