Create a close/exit button that works when you disable Alt-F4
Add-Type -AssemblyName System.Windows.Forms $form = New-Object 'System.Windows.Forms.Form' $form.AutoScaleDimensions = '8, 17' $form.AutoScaleMode = 'Font' $form.ClientSize = '416, 262' $form.FormBorderStyle = 'FixedDialog' $form.Margin = '5, 5, 5, 5' $form.MaximizeBox = $False $form.MinimizeBox = $False $form.ControlBox = $False $form.Name = 'Test1' $form.StartPosition = 'CenterScreen' $form.Text = 'Test2' $form.TopMost = $True # force window to stay on top $form.add_Load($form_Load) $button = New-Object 'System.Windows.Forms.Button' $button.Font = 'Calibri, 12.25pt' $button.DialogResult = 'OK' $button.Location = '110, 165' $button.Margin = '5, 5, 5, 5' $button.Name = 'buttonOK' $button.Size = '200, 50' $button.BackColor ="LightGray" $button.ForeColor ="black" $button.Text = '&CLOSE' $button.UseCompatibleTextRendering = $True $button.UseVisualStyleBackColor = $False $button.Add_Click({$form.Add_FormClosing({$_.Cancel=$false});$form.Close()}) $button.Show()#$button.Hide() $form.Controls.Add($button) # Disable other types of close/exit $form.add_FormClosing({$_.Cancel=$true}) [void] $form.ShowDialog()