[void][System.Reflection.Assembly]::LoadWithPartialName('Microsoft.VisualBasic')  
 
 $result = [Microsoft.VisualBasic.Interaction]::MsgBox
("Do you agree?", 'YesNoCancel,Question', "Respond please")  
 
 switch ($result) {  
   'Yes'        { "Ah good" }  
   'No'        { "Sorry to hear that" }  
   'Cancel'    { "Bye..." }  
 }