在窗体上画一个名为Command1的命令按和一个名为Text1的文本框,并把窗体的 KeyPreview 属性设置为True,然后编写如下代码: Dim SaveAll As String Private Sub Form_ Load () Show Text1.Text = ' ' TextSetFocus End Sub Private Sub Command1 Click() TextText= LCase(SaveAll) End Sub Private Sub Form_ KeyPress (KeyAscii As Integer) SaveAll = SaveAll + Chr(KeyAscii) End Sub程序运行后,在键盘上输入ABCDEFG,单击命令按,则文本框中显示的内容为 ______。