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rekha sharmarekha sharma 

In apex do we something like Extend keyword as in java

In java we can extend the properties, can we do the same in case of apex

for eg: what if i want to override the properties of <apex:command button> to toggle button?

Best Answer chosen by Admin (Salesforce Developers) 
sai.sfsai.sf

http://www.salesforce.com/us/developer/docs/apexcode/Content/apex_classes_interfaces.htm