Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Button1.BackColor = Color.Black Button1.ForeColor = Color.White Button1.FlatAppearance.BorderColor = System.Drawing.Color.Red Button1.FlatAppearance.BorderSize = 1 Button1.FlatStyle = System.Windows.Forms.FlatStyle.Flat End Sub End Class

Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Button1.BackColor = Color.Black Button1.ForeColor = Color.White Button1.FlatAppearance.BorderColor = System.Drawing.Color.Red Button1.FlatAppearance.BorderSize = 1 Button1.FlatStyle = System.Windows.Forms.FlatStyle.Flat End Sub End Class

.NET 2.0 allows FlatAppearance properties to be set, but the help text says it is read only.   The FlatAppearance property is of type FlatButtonAppearance.  You can't set the property value itself, but you can access the property and set the FlatButtonAppearance property values.  (See http://msdn2.microsoft.com/en-us/library/system.windows.forms.flatbuttonappearance_members.aspx for a list of ava

Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Button1.BackColor = Color.Black Button1.ForeColor = Color.White Button1.FlatAppearance.BorderColor = System.Drawing.Color.Red Button1.FlatAppearance.BorderSize = 1 Button1.FlatStyle = System.Windows.Forms.FlatStyle.Flat End Sub End Class

Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Button1.BackColor = Color.Black Button1.ForeColor = Color.White Button1.FlatAppearance.BorderColor = System.Drawing.Color.Red Button1.FlatAppearance.BorderSize = 1 Button1.FlatStyle = System.Windows.Forms.FlatStyle.Flat End Sub End Class