I'm not sure if you can override the drawing of the border and if you could not sure how you would add control to the border.
You can temporarily change the border style before you maximize the form. And you can overload the client event to handle re-sizing the form yourself.
Are there any other reasons you dont want to go with Formborderstyle.none
?
Public Class Form1
Inherits Windows.Forms.Form
Private Const BorderWidth As Integer = 30 'This is just for demo purposes.
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Panel1.Location = New Point(Me.Width - BorderWidth, 0)
Panel1.Width = BorderWidth
End Sub
Public xLocation, yLocation As Integer
Private Sub Panel1_MouseDown(sender As System.Object, e As System.Windows.Forms.MouseEventArgs) Handles Panel1.MouseDown
xLocation = PointToScreen(Cursor.Position).X
yLocation = PointToScreen(Cursor.Position).Y
End Sub
Private Sub Panel1_MouseUp(sender As System.Object, e As System.Windows.Forms.MouseEventArgs) Handles Panel1.MouseUp
'Stop resizing form
Me.Width = Me.Width + (PointToScreen(Cursor.Position).X - xLocation)
xLocation = PointToScreen(Cursor.Position).X
yLocation = PointToScreen(Cursor.Position).Y
End Sub
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
Me.FormBorderStyle = Windows.Forms.FormBorderStyle.Sizable
Me.WindowState = FormWindowState.Maximized
Me.FormBorderStyle = Windows.Forms.FormBorderStyle.None
End Sub
End Class