This component is a west region. The default class of CSS is specified "layout-region-west".

    <borderlayout height="500px">
    <north size="50%" border="0">    
        <borderlayout>        
            <west size="25%" border="none" flex="true">            
                <div style="background:#B8D335">                
                    <label value="25%"                    
                        style="color:white;font-size:50px" />                        
                </div>                
            </west>            
            <center border="none" flex="true">            
                <div style="background:#E6D92C">                
                    <label value="25%"                    
                        style="color:white;font-size:50px" />                        
                </div>                
            </center>            
            <east size="50%" border="none" flex="true">            
                <label value="Here is a non-border"                
                    style="color:gray;font-size:30px" />                    
            </east>            
        </borderlayout>        
    </north>    
    <center border="0">    
        <borderlayout>        
            <west size="30%" flex="true" border="0">            
                <div style="background:#E6D92C">                
                    <label value="30%"                    
                        style="color:white;font-size:50px" />                        
                </div>                
            </west>            
            <center>            
                <label value="Here is a border"                
                    style="color:gray;font-size:30px" />                    
            </center>            
            <east size="30%" flex="true" border="0">            
                <div style="background:#B8D335">                
                    <label value="30%"                    
                        style="color:white;font-size:50px" />                        
                </div>                
            </east>            
        </borderlayout>        
    </center>    
</borderlayout