WPF window with custom chrome has unwanted outline on right and bottom

Question

I have created a WPF window with custom chrome using the Microsoft.Windows.Shell dll. Here is the code for that:

                  
        
        

          

            
            

              
              

            
    


                                 
              
            
                          
    

        
         

                验证码
                

                  
                
                

                   看不清?
                
              
                                  

                    
   
                 
             
              
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