Multiple text box prob

I am trying to make a login program that uses number buttons instead of the keyboard. the program has ten number buttons(like a keypad), I can't seem to figure out how to get the number buttons to put data into the text box that is CURRENTLY SELECTED. If textBoxID was selected and then I entered some numbers, when I select the PinTextBox the numbers still go into the textBoxID, here's the entire code:

Code:

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Public Class Form7
    Inherits System.Windows.Forms.Form
    Dim strPinNumber, strIDNumber As String

  Private Sub ButtonBack_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonBack.Click
        Dim f1 As New Form1
        f1.Show()
        Me.Hide()
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        strPinNumber += "1"
        strIDNumber += "1"

        If TextBoxAccountID.SelectionStart Then
            TextBoxAccountID.Text = strIDNumber
        Else
            TextBoxPinNumber.Text = strPinNumber
        End If
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        strPinNumber += "2"
        strIDNumber += "2"

        If TextBoxAccountID.SelectionStart Then
            TextBoxAccountID.Text = strIDNumber
        Else
            TextBoxPinNumber.Text = strPinNumber
        End If
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        strPinNumber += "3"
        strIDNumber += "3"

        If TextBoxAccountID.SelectionStart Then
            TextBoxAccountID.Text = strIDNumber
        Else
            TextBoxPinNumber.Text = strPinNumber
        End If
    End Sub

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        strPinNumber += "5"
        strIDNumber += "5"

        If TextBoxAccountID.SelectionStart Then
            TextBoxAccountID.Text = strIDNumber
        Else
            TextBoxPinNumber.Text = strPinNumber
        End If

    End Sub

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        strPinNumber += "6"
        strIDNumber += "6"

        If TextBoxAccountID.SelectionStart Then
            TextBoxAccountID.Text = strIDNumber
        Else
            TextBoxPinNumber.Text = strPinNumber
        End If
    End Sub

    Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
        strPinNumber += "7"
        strIDNumber += "7"

        If TextBoxAccountID.SelectionStart Then
            TextBoxAccountID.Text = strIDNumber
        Else
            TextBoxPinNumber.Text = strPinNumber
        End If

    End Sub

    Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click
        strPinNumber += "7"
        strIDNumber += "7"

        If TextBoxAccountID.SelectionStart Then
            TextBoxAccountID.Text = strIDNumber
        Else
            TextBoxPinNumber.Text = strPinNumber
        End If
    End Sub

    Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click
        strPinNumber += "8"
        strIDNumber += "8"

        If TextBoxAccountID.SelectionStart Then
            TextBoxAccountID.Text = strIDNumber
        Else
            TextBoxPinNumber.Text = strPinNumber
        End If
    End Sub

    Private Sub Button9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button9.Click
        strPinNumber += "9"
        strIDNumber += "9"

        If TextBoxAccountID.SelectionStart Then
            TextBoxAccountID.Text = strIDNumber
        Else
            TextBoxPinNumber.Text = strPinNumber
        End If
    End Sub

    Private Sub Button0_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button0.Click
        strPinNumber += "0"
        strIDNumber += "0"

        If TextBoxAccountID.SelectionStart Then
            TextBoxAccountID.Text = strIDNumber
        Else
            TextBoxPinNumber.Text = strPinNumber
        End If
    End Sub

    Private Sub ButtonLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonLogin.Click

    End Sub

    Private Sub ButtonClearText_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonClearText.Click

        If TextBoxAccountID.SelectionStart Then
            TextBoxAccountID.Text = Mid(TextBoxAccountID.Text, 1, TextBoxAccountID.Text.Length - 1)
            strIDNumber = strIDNumber.Substring(0, strIDNumber.Length - 1)
        Else
            TextBoxPinNumber.Text = Mid(TextBoxPinNumber.Text, 1, TextBoxPinNumber.Text.Length - 1)
            strPinNumber = strPinNumber.Substring(0, strPinNumber.Length - 1)

        End If
    End Sub
End Class

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The user would need to click in one of the TextBoxes to indicate the destination of the numbers they are about to enter. So you could capture that event and store a variable that indicates which they selected.

Code:

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    Private Sub TextBox1_Enter(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles TextBox1.Enter
        SelectedFirstTextBox = True
    End Sub
    Private Sub TextBox2_Enter(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles TextBox2.Enter
        SelectedFirstTextBox = False
    End Sub

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Thanks bulldog, that was just what I was looking for!