窗体中有3个按钮Command1、Command2和Command3，该程序的功能是当单击按钮Command1时，按钮2可用，按钮3不可见，正确的程序是 Private Sub Command1_Click() Command2. Visible=False Command3. Enabled=TrueEnd Sub Private Sub Commnd1_Click() Command2. Visible=False Command3. Enabled=False End Sub Private Sub Command1_Click() Command2. Enabled=True Command3. Visible=FalseEnd Sub Private Sub Command1_Click() Command2. Visible=True Command3. Enabled=True End Sub