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在窗体上画一个名称为Drivel的驱动器列表框,一个名称为Dirl的目录列表框。当改变当前驱动器时,目录列表框应该与之同步改变。设置两个控件同步的命令放在一个事件过程中,这个事件过程是 ______。

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Dirve1.Drive=Dir1.Path  Dir1.Path=Drive1.Drive  Dir1.Path=File1.Path  File1.Path=Dir1.Path  
Dirvel.Drive=Dirl.Path  Dirl.Path=Drivel.Drive  Dirl.Path=Filel.Path  Filel.Path=Dirl.Path  
Dirve1.Drive=Dir1.Path  Dir1.Path=Drive1.Drive  Dir1.Path=FilePath  File1.Path=Dir1.Path  
Dirvel.Drive=Dir1.Path  Dir1.Path=Drive1.Drive  Dir1.Path=File1.Path  File1.Path=Dir1.Path  
PriVate Sub Dir1_Change() FilePath=Dir1.Path End Sub Private Sub Dirvel_Change() Dir1.Path=DriveDrive LabelCaption=FileListCount End Sub  Private Sub Dir1_Change() FilePath=Dir1.Path End Sub Private Sub Drivel_Change() DirPath=DriveDrive LabelCaption=FileList End Sub  Private Sub Dir1_Change() FilePath=Dir1.Path LabelCaption=File1.ListCount End Sub Private Sub Drivel_Change() Dir1.Path=DriveDrive LabelCaption=Fil1.ListCount End Sub  Private Sub Dir1_Change() File1.Path=Dir1.Path LabelCaption=FileList End Sub Private Sub Drivel_Change() Dir1.Path=DriveDrive LabelCaption=FileList End Sub  
DirveDrive=DirPath  DirPath=DriveDrive  DirPath=FilePath  FilePath=DirPath  
Dirve1.Drive=Dir1.Path  Dir1.Path=Drive1.Drive  Dir1.Path=File1.Path  File1.Path=Dir1.Path  
Dirve1.Drive=Dir1.Path  Dir1.Path=Drive1.Drive  Dir1.Path=File1.Path  File1.Path=Dir1.Path  

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