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label: {
   text: 'Test',
   color: '#000',
   bgColor: 'rgba(123,213,0,0.95)'
} 

BX.SidePanel.Instance.open(url,
 {
     allowChangeHistory: false,
     cacheable: false,
     width: 700,
     label: {
               text: 'Test',
               color: '#000',
               bgColor: 'rgba(123,213,0,0.95)'
     }     
});