设窗体上有一个名为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_KeyDown(KeyCode As Integer, Shift As Integer) Print "Visual Basic";
End Sub 程序运行后，如果在文本框中输入字母“a”，然后单击窗体，则在窗体上显示的内 容是______。