Refresh Array checkboxes with Powershell

I am trying to create a script that lets the user choose a server from a drop down list. Each server is mapped to a unique array which goes to a foreach loop. The loop cycles through the array and prints a check box on to the form with the value that is in the array. This works with no issue. The problem is when I select the different Server from the drop down list and click "Select Server" button the new values in the Array do not overwrite the existing values. In other words the check box values on the form are not updating with the new array values. What I would like to happen is when you click the "Select Server" button the check box values update to reflect the array values associated with their corresponding server.

Here is an example.

1. Choose ServerA from drop down
2. Select 'Select Server'
3. The following check boxes will list out on to the form in checkbox's:@('Zero','One','Two','Three')
4. Now if you click ServerB and select "Select Server" I would expect new check boxes to overwrite the existing check boxes with these values: @('0','1','2','3')

Unfortunately the values do not update. I need to have the array values update when the "Select Server" button is selected... Ive looked around at forums and have found some possible solutions but they all seems to fall short.

Thank you in advance.

function GenerateForm 
{   
$PC=
{
    $hostname = $dropdown.SelectedItem
    
    if ($hostname -eq "ServerA")

        { $CheckBoxLabels = @('Zero','One','Two','Three')
        }
    elseif($hostname -eq "ServerB")
        {
           $CheckBoxLabels = @('0','1','2','3')
     }
        
    $name = New-Object System.Windows.Forms.Label -Property @{
    Text = "Start Time"
    Location = "900, 220"
    ForeColor = "Black"
    Height = 22
    Width = 200
    }
    $form1.Controls.Add($hostname)
        
    $CheckBoxCounter = 1
    
    $CheckBoxes = foreach($Label in $CheckBoxLabels) 
    {   
        $CheckBox = New-Object System.Windows.Forms.CheckBox        
        $CheckBox.UseVisualStyleBackColor = $True
        $System_Drawing_Size = New-Object System.Drawing.Size
        $System_Drawing_Size.Width = 104
        $System_Drawing_Size.Height = 24
        $CheckBox.Size = $System_Drawing_Size
        $CheckBox.TabIndex = 2
    
        $CheckBox.Text = $Label
        
        $System_Drawing_Point = New-Object System.Drawing.Point
        $System_Drawing_Point.X = 27
        # Make sure to vertically space them dynamically, counter comes in handy
        $System_Drawing_Point.Y = 200 + (($CheckBoxCounter - 1) * 31) #Controls location on Y axis
        $CheckBox.Location = $System_Drawing_Point
        $CheckBox.DataBindings.DefaultDataSourceUpdateMode = 0

        # Give it a unique name based on our counter
        $CheckBox.Name = "CheckBox$CheckBoxCounter"

       $form1.Controls.Add($CheckBox)

        # return object ref to array
        $Global:CheckBox
        # increment our counter
        $CheckBoxCounter++
    }
    }

    $form1 = New-Object System.Windows.Forms.Form
    $form1.Text = "UCCE Log Collector - Version 2.0"
    $form1.Name = "form1"
    $form1.DataBindings.DefaultDataSourceUpdateMode = 0
    $System_Drawing_Size = New-Object System.Drawing.Size
    $System_Drawing_Size.Width = 1150
    $System_Drawing_Size.Height = 500
    $form1.ClientSize = $System_Drawing_Size

$dropdown = New-Object System.Windows.Forms.ListBox
$dropdown.Location = New-Object System.Drawing.Point(10,50)
$dropdown.Size = New-Object System.Drawing.Size(100,20)
$dropdown.Height = 80

[void] $dropdown.Items.Add('ServerA')
[void] $dropdown.Items.Add('ServerB')


$form1.Controls.Add($dropdown)

    ######### Select Server Button
    $SelectPC = New-Object System.Windows.Forms.Button
    $SelectPC.TabIndex = 4
    $SelectPC.Name = "SelectPC"
    $System_Drawing_Size = New-Object System.Drawing.Size
    $System_Drawing_Size.Width = 120
    $System_Drawing_Size.Height = 30
    $SelectPC.Size = $System_Drawing_Size
    $SelectPC.UseVisualStyleBackColor = $True
    $SelectPC.Text = "Select Server"
    $System_Drawing_Point = New-Object System.Drawing.Point
    $System_Drawing_Point.X = 0 # 0
    $System_Drawing_Point.Y = 150 #150
    $SelectPC.Location = $System_Drawing_Point
    $SelectPC.DataBindings.DefaultDataSourceUpdateMode = 0
    $SelectPC.add_Click($PC)

    $form1.Controls.Add($SelectPC)
    
        $result = $form1.ShowDialog()
    $result

}
GenerateForm