Server controls like Datagrid, DataList, Repeater can have other child controls insidethem. Example DataGrid can have combo box inside datagrid. These child control do notraise there events by themselves, rather they pass the event to the container parent (whichcan be a datagrid, datalist, repeater), which passed to the page as “ItemCommand” event.As the child control send there events to parent this is termed as event bubbling
