Richselect Resizer

Hi
i have richselect view in which i will get dynamic data in it i want to make the rich select pop up to be fixed to specific height so that i can have scroll to see the data

Code i am using is this

{ 
				view:"richselect", 
				//width:300,
            autoHeight:true,			
				yCount:4,
				scroll:"y",
				label: 'Fruit',  name:"fruit1",
				options:[
					{ id:1, value:"Banana"   }, 
					{ id:2, value:"Papaya"   }, 
					{ id:3, value:"Apple" },
					{ id:4, value:"Banana"   }, 
					{ id:5, value:"Papaya"   }, 
					{ id:6, value:"Apple" },
					{ id:7, value:"Banana"   }, 
					{ id:8, value:"Papaya"   }, 
					{ id:9, value:"Apple" }
				]
			},
{ view:"richselect", 
       options:{          
         body:{              
           yCount:4,
           data:your_data
         }
       }
},