A better way to do this?

So, I want the new values to load everytime the combobox selection is changed, but I don't want the accept button enabled until the textboxes are changed by the user. So, I fixed the problem by creating a boolean and setting it before and after filling the boxes.

But, is there a better way to do this?

VB Code:

Dim NonUI As Boolean = True
 
    Private Sub cmbTable_SelectedValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmbTable.SelectedValueChanged
        Me.btnAccept.Enabled = False
 
        Me.NonUI = False
        Me.txtRollUp.Value = Me.cmbTable.Columns("RollupMarkup").CellValue(Me.cmbTable.SelectedIndex)
        Me.txtSell.Value = Me.cmbTable.Columns("SellMarkup").CellValue(Me.cmbTable.SelectedIndex)
        Me.NonUI = True
    End Sub
 
    Private Sub btnAccept_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAccept.Click
'update the fields in the db
 
        Me.btnAccept.Enabled = False
    End Sub
 
    Private Sub txtRollUp_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtRollUp.TextChanged
        If Me.NonUI = True Then Me.btnAccept.Enabled = True
    End Sub
 
    Private Sub txtSell_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtSell.TextChanged
        If Me.NonUI = True Then Me.btnAccept.Enabled = True
    End Sub