question

Hi
Here is a stand alone example that may help. This is for dynamically adding Buttons but the principle is the same for most/any controls. It can easily be changed to add CheckBoxes if needed - just adjust the Properties being added. See line 26, where the same event handler is allocated to each Button.

 ' Blank Form1, copy/replace all
 ' default code with this code
 Option Strict On
 Option Explicit On
 Public Class Form1
   Dim pan As New Panel
   Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
     Size = New Size(500, 300)
     With pan
       .Location = New Point(5, 5)
       .Size = New Size(ClientSize.Width - 20, 220)
       .BackColor = Color.Beige
       .BorderStyle = BorderStyle.FixedSingle
     End With
     Controls.Add(pan)
     SetButtons(18)
   End Sub
   Sub SetButtons(num As Integer)
     Dim x As Integer = 2
     Dim y As Integer = 5
     Dim yStep As Integer = 30
     Dim cs As Integer = pan.Height
     For i As Integer = 1 To num
       Dim mybutton As New Button With {.Text = "Button" & i.ToString(), .Name = "Button" & i.ToString(), .Location = New Point(x, y), .BackColor = Color.LightGray, .AutoSize = True}
       pan.Controls.Add(mybutton)
       AddHandler mybutton.Click, AddressOf ButtonClick
       y += yStep
       If y + yStep >= cs Then
         x += 100
         y = 5
       End If
     Next
   End Sub
   Public Sub ButtonClick(sender As Object, e As EventArgs)
     Dim butt As Button = DirectCast(sender, Button)
     MessageBox.Show("Selected Button = " & butt.Name)
   End Sub
 End Class

I found a nice simple solution (based on some code found here.)

(see: "checkboxes" array defined in original question.)

Right after the array assignment, I added:

 >         For intCnt = 0 To UBound(checkboxes)
 >             AddHandler checkboxes(intCnt).CheckedChanged, AddressOf _CheckedChanged
 >         Next

Then, at the end of my code, I added the following Event Handler:

 >     Private Sub _CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
 >         If sender.checked Then
 >             For intCnt = 0 To UBound(checkboxes)
 >                 If checkboxes(intCnt) Is sender Then
 >                     intChecked += 1
 >                 End If
 >             Next intCnt
 >         Else
 >             intChecked -= 1
 >         End If
 >         lblChecked.Text = intChecked
 >     End Sub

The "_CheckedChanged" event is now triggered no matter which checkbox is clicked (PROBLEM: checkboxes NOT in the array are triggered too.)

I'll update my answer when I find a fix to ignore checkboxes not in the array.

UPDATE: I found a (simplistic) way of ignoring other checkboxes simply by checking the "sender.Name" property in the "If/Then" (VB won't show it as an option in the popup, but it's valid.)

If sender.checked And InStr(sender.name, "chkThumb") > 0 Then