Custom Control not working

[Rabastan]

I have a form that requires several Comboboxes and TextBoxes when I tried it on one box it works:

Public Class frmStart

    'Code for Combobox Borders
    Public Sub New()

        ' This call is required by the designer.
        InitializeComponent()
        ' Add any initialization after the InitializeComponent() call.
        AddHandler Me.Paint, AddressOf DrawComboBlueBorder
    End Sub
    Private Sub DrawComboBlueBorder(ByVal sender As Object, ByVal e As PaintEventArgs)
        Dim rect As New Rectangle(Me.cboCallType.Location.X - 1,
                                  Me.cboCallType.Location.Y - 1,
                                  Me.cboCallType.Width + 2,
                                  Me.cboCallType.Height + 2)

        Dim pen As New Pen(Color.FromArgb(0, 172, 238), 2)
        Dim g As Graphics = e.Graphics
        g.DrawRectangle(pen, rect)
    End Sub

End Class

So I attempted to move it to a Class Library (Which I have never done before) Here is what I have, When I import the control in to my Tools, and use it, I get no border

Imports System.Windows.Forms
Imports System.Drawing
Imports System.EventArgs

Public Class BorderComboBox
    Inherits ComboBox

    Public Sub New()
        AddHandler Me.Paint, AddressOf DrawComboBlueBorder
    End Sub
    Private Sub DrawComboBlueBorder(ByVal sender As Object, ByVal e As PaintEventArgs)
        Dim rect As New Rectangle(Me.Location.X - 1,
                                  Me.Location.Y - 1,
                                  Me.Width + 2,
                                  Me.Height + 2)

        Dim pen As New Pen(Color.Red, 2)
        Dim g As Graphics = e.Graphics
        g.DrawRectangle(pen, rect)
    End Sub
End Class

Like I said, I am just getting in to more advanced stuff, Thanks in advance for any help

[jmcilhinney]

There's a REALLY big difference between your two code snippets. In the first, you are handling the Paint event of the form and drawing ON THE FORM. In the second, you're handling the Paint event of the control and drawing on the control. That is completely different.

[Sitten Spynne]

Further, when you're drawing on a control it tends to be clipped to its bounds. That means anything you draw outside of its area won't actually be drawn. Since your border tries to be on the outside of the combo box, it won't be visible.

So you'll have to draw the border inside the bounds, which means the border will overlap some of the combo box. This is easily solved by making a different custom control (it could really be a UserControl). The cheapest possible way is to make a Panel with a Blue background, then place a ComboBox inside of it and write code to size the ComboBox slightly smaller than the Panel. If you do that, then set the ComboBox's Anchor property so it resizes as the Panel resizes, it ought to have the same effect.