assim pode funcionar
Private Sub Text1_KeyDown(KeyCode As Integer, Shift As Integer)
Text1.Text = UCase(Text1.Text)
End Sub
Private Sub Text1_KeyPress(KeyAscii As Integer)
Text1.Text = UCase(Text1.Text)
End Sub
Private Sub Text1_KeyUp(KeyCode As Integer, Shift As Integer)
Text1.Text = UCase(Text1.Text)
End Sub
Private Sub Text1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
Text1.Text = UCase(Text1.Text)
End Sub
Private Sub Text1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
Text1.Text = UCase(Text1.Text)
End Sub
Private Sub Text1_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single)
Text1.Text = UCase(Text1.Text)
End Sub