在窗体上画一个名称为Text1的文本框，并编写如下程序： Private Sub Form_Load( ) Show Text1. Text = " " Text1. SetFocus End Sub Private Sub Form_MouseUp(Button As Integer, Shift As Integer, X As Single, Y _ As Single) Print "程序设计" End Sub Private Sub Text1_Ke!tDown(KeyCode As Integer,Shift As Integer) Print "Visual Basic"; End Sub 程序运行后，如果按A键，然后单击窗体，则在窗体上显示的内容是 ______。