showing message box on control's modal popup extender

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栀梦 2021-01-23 15:19
I have a control inside a page that has the following modal popup extender:

      
      
        
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                   旧巷少年郎
                                             
                
                
                (楼主)
            
              
              
                2021-01-23 16:05
              

            
            
                        
Just use JavaScript, there a bunch of ways to do it here is one example:






    
             
                                                        
            
            
              
                
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