powershit/test/Show-Control.ps1

# Displays one or more controls.  Controls are piped to Show-Control
function Show-Control {

cmdlet `
   -DefaultParameterSet VisualElement
   param(
   
   [Parameter(Mandatory=$true,
   ParameterSetName="VisualElement",
   ValueFromPipeline=$true,
   ValueFromPipelineByPropertyName=$true)]      
   [Windows.Media.Visual]
   $control,     
   
   [Parameter(Mandatory=$true,
   ParameterSetName="Xaml",
   ValueFromPipeline=$true,
   ValueFromPipelineByPropertyName=$true)]      
   [string]
   $xaml,     
   
   [Parameter(ValueFromPipelineByPropertyName=$true,Position=0)]      
   [Hashtable]
   $event,
     
   [Hashtable]
   $windowProperties,
   
   # If this switch is set, outputs a psuedoobject of the control and events
   [switch]
   $outputControl
   )

   Begin
   {
       $window = New-Object Windows.Window
       $window.SizeToContent = "WidthAndHeight"
       if ($windowProperties) {
           foreach ($kv in $windowProperties.GetEnumerator()) {
               $window."$($kv.Key)" = $kv.Value
           }
       }
       $visibleElements = @()
       $windowEvents = @()
   }

   Process
   {   
       Write-Verbose "Xaml: $xaml"
       Write-Verbose "Events: $($event | Out-String)"    
       switch ($psCmdlet.ParameterSetName)
       {
       "Xaml" {
           $f = [System.xml.xmlreader]::Create([System.IO.StringReader] $xaml)
           $visibleElements+=([system.windows.markup.xamlreader]::load($f))       
       }
       "VisualElement" {
           $visibleElements+=$control
       }
       } 
       if ($event) {
           $element = $visibleElements[-1]       
           foreach ($evt in $event.GetEnumerator()) {
               # If the event name is like *.*, it is an event on a named target, otherwise, it's on any of the events on the top level object
               if ($evt.Key.Contains(".")) {
                   $targetName = $evt.Key.Split(".")[1].Trim()
                   if ($evt.Key -like "Window.*") {
                       $target = $window
                   } else {
                       $target = ($visibleElements[-1]).FindName(($evt.Key.Split(".")[0]))                   
                   }                       
               } else {
                   $target = $visibleElements[-1]
                   $targetName = $evt.Key
               }
               $target | Get-Member -type Event |
                 ? { $_.Name -eq $targetName } |
                 % {
                   $eventMethod = $target."add_$targetName"
                   $eventMethod.Invoke($evt.Value)                   
               }               
           }
       }
    }

    End
    {
        if ($visibleElements.Count -gt 1) {
            $wrapPanel = New-Object Windows.Controls.WrapPanel
            $visibleElements | % { $null = $wrapPanel.Children.Add($_) }
            $window.Content = $wrapPanel
        } else {
            if ($visibleElements) { 
                $window.Content = $visibleElements[0]
            }
        }
        if ($outputControl) {
            $true | Select-Object @{Name='Control';Expression={$visibleElements}},
              @{Name='Event';Expression={$event}}
        } else {
            $null = $window.ShowDialog()
            $window.Tag
        }
    }
}