各位大神，我想使cmdNext按钮在TEXT1，TEXT2，TEXT3都输入数值之后才能按，之前都是灰色，以下是我的程序，可是不能用，请问错在哪里了
Private Sub Frame1_DragDrop(Source As Control, X As Single, Y As Single)

      
End Sub
Private Sub Form1_Load()
 If Len(Text1) = 0 And Len(Text2) = 0 And Len(Text3) = 0 Then
       cmdNext.Enabled = False
       Else
        cmdNext.Enabled = True
       End If

End Sub
Private Sub cmdClear_Click()
Text1.Text = ""
Text2.Text = ""
Text3.Text = ""
End Sub

Private Sub cmdNext_Click()

Form2.Show
form1.Hide

End Sub