Add Commands to WinForms - winforms

Question

I got the following WinForm. How can I add commands to it?
The SamAccountName Field is for for the User/Group name. How do I catch this input?
The list shoud be a list with 2 entries:
user
group
This is the point where the user decides wether it's a group or a user and it would be awesome if I could somehow save that in a variable.
The search button should trigger the actual commands (a wildcard search for user or group).
$DataGridView1 should display the output of the executed commands.
The executed code would be: (User OR Groups is separated from the WinForms I'm not sure how to format it right)
User:
Get-ADUser -Filter "CN -like '*$find*' -or DisplayName -like '*$find*' -or Description -like '*$find*' -or DistinguishedName -like '*$find*' -or Mail -like '*$find*'" -Properties * |
Sort-Object |
Format-Table SamAccountName, DisplayName
Group:
Get-ADGroup -Filter "SamAccountName -like '*$find*'" -Properties * |
Sort-Object |
Format-Table SamAccountName, Description
Add-Type -AssemblyName System.Windows.Forms
[System.Windows.Forms.Application]::EnableVisualStyles()
$Form = New-Object system.Windows.Forms.Form
$Form.ClientSize = '692,401'
$Form.text = "Form"
$Form.TopMost = $false
$SamAccountName = New-Object system.Windows.Forms.TextBox
$SamAccountName.multiline = $false
$SamAccountName.width = 100
$SamAccountName.height = 20
$SamAccountName.location = New-Object System.Drawing.Point(20,30)
$SamAccountName.Font = 'Microsoft Sans Serif,10'
$Search = New-Object system.Windows.Forms.Button
$Search.text = "button"
$Search.width = 60
$Search.height = 30
$Search.location = New-Object System.Drawing.Point(143,30)
$Search.Font = 'Microsoft Sans Serif,10'
$DataGridView1 = New-Object system.Windows.Forms.DataGridView
$DataGridView1.width = 675
$DataGridView1.height = 250
$DataGridView1.location = New-Object System.Drawing.Point(9,135)
$User = New-Object system.Windows.Forms.CheckBox
$User.text = "User"
$User.AutoSize = $false
$User.width = 95
$User.height = 13
$User.location = New-Object System.Drawing.Point(25,72)
$User.Font = 'Microsoft Sans Serif,10'
$Group = New-Object system.Windows.Forms.CheckBox
$Group.text = "Group"
$Group.AutoSize = $false
$Group.width = 95
$Group.height = 20
$Group.location = New-Object System.Drawing.Point(25,94)
$Group.Font = 'Microsoft Sans Serif,10'
$Form.controls.AddRange(#($SamAccountName,$Search,$DataGridView1,$User,$Group))
$Form.ShowDialog() | Out-Null