Powershell Listbox Items verschieben

function FormEntryEditor {

#region Generated Form Objects
$formEntryEditor = New-Object System.Windows.Forms.Form
$btnSort = New-Object System.Windows.Forms.Button
$btnToBottom = New-Object System.Windows.Forms.Button
$btnToTop = New-Object System.Windows.Forms.Button
$btnRemove = New-Object System.Windows.Forms.Button
$btnAdd = New-Object System.Windows.Forms.Button
$txtAdd = New-Object System.Windows.Forms.TextBox
$btnCancel = New-Object System.Windows.Forms.Button
$btnSave = New-Object System.Windows.Forms.Button
$btnDown = New-Object System.Windows.Forms.Button
$btnUp = New-Object System.Windows.Forms.Button
$lbItems = New-Object System.Windows.Forms.ListBox
$InitialFormWindowState = New-Object System.Windows.Forms.FormWindowState
#endregion Generated Form Objects

$handler_btnCancel_Click= 
{
    $Global:result = $false
}

$handler_btnDown_Click= 
{
    $lbItems.Sorted = $false
    $intSelIndex = $lbItems.SelectedIndex
    if ($intSelIndex -lt $lbItems.Items.Count -1 -and $intSelIndex -ne -1){
        $val = $lbItems.SelectedItem
        $lbItems.Items.RemoveAt($intSelIndex)
        $lbItems.Items.Insert($intSelIndex +1,$val)
        $lbItems.SelectedIndex = $intSelIndex +1
    }
}

$handler_btnUp_Click= 
{
    $lbItems.Sorted = $false
    $intSelIndex = $lbItems.SelectedIndex
    if ($intSelIndex -gt 0){
        $val = $lbItems.SelectedItem
        $lbItems.Items.RemoveAt($intSelIndex)
        $lbItems.Items.Insert($intSelIndex -1,$val)
        $lbItems.SelectedIndex = $intSelIndex -1
    }

}

$handler_formEntryEditor_Load= 
{

}

$handler_btnRemove_Click= 
{
    . $removeListBoxEntry
}

$handler_btnAdd_Click= 
{
    if ($txtAdd.Text -ne ""){  
        $lbItems.Sorted = $false
        $intSelIndex = $lbItems.SelectedIndex
        if ($intSelIndex -eq -1){
            $lbItems.Items.Add($txtAdd.Text)
        }else{
            $lbItems.Items.Insert($intSelIndex,$txtAdd.Text)
        }
        $txtAdd.Text = ""  
    }
}

$handler_formEntryEditor_FormClosed= 
{

}

$handler_btnSave_Click= 
{
    $arrNewOrder = [string[]]$lbItems.Items
    $Script:result = $arrNewOrder
}


$btnToBottom_OnClick= 
{
    $lbItems.Sorted = $false
    $intSelIndex = $lbItems.SelectedIndex
    if ($intSelIndex -ne -1){
        $val = $lbItems.SelectedItem
        $lbItems.Items.RemoveAt($intSelIndex)
        $lbItems.Items.Insert($lbItems.Items.Count,$val)
        $lbItems.SelectedIndex = $lbItems.Items.Count - 1
    }

}

$btnToTop_OnClick= 
{
    $lbItems.Sorted = $false
    $intSelIndex = $lbItems.SelectedIndex
    if ($intSelIndex -ne -1){
        $val = $lbItems.SelectedItem
        $lbItems.Items.RemoveAt($intSelIndex)
        $lbItems.Items.Insert(0,$val)
        $lbItems.SelectedIndex = 0
    }
}

$handler_lbItems_SelectedIndexChanged= 
{

}

$handler_btnSort_Click= 
{
    $lbItems.Sorted = $true
}

$handler_lbItems_KeyUp= 
{
    switch ($_.KeyCode){
        "Delete" {  
            . $removeListBoxEntry
        }
    }
}

$handler_txtAdd_KeyDown = {
    if ($_.KeyCode -eq "Enter"){. $handler_btnAdd_Click}  
}
$OnLoadForm_StateCorrection=
{#Correct the initial state of the form to prevent the .Net maximized form issue
	$formEntryEditor.WindowState = $InitialFormWindowState
}

$removeListBoxEntry = {
    if ($lbItems.SelectedIndex -ne -1){
        $oldIndex = $lbItems.SelectedIndex
        $lbItems.Items.RemoveAt($lbItems.SelectedIndex)
        if ($lbItems.Items.Count -gt $oldIndex){$lbItems.SelectedIndex = $oldIndex}
    }

}

#----------------------------------------------
#region Generated Form Code
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 300
$System_Drawing_Size.Width = 337
$formEntryEditor.ClientSize = $System_Drawing_Size
$formEntryEditor.DataBindings.DefaultDataSourceUpdateMode = 0
$formEntryEditor.FormBorderStyle = 6
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 326
$System_Drawing_Size.Width = 345
$formEntryEditor.MinimumSize = $System_Drawing_Size
$formEntryEditor.Name = "formEntryEditor"  
$formEntryEditor.StartPosition = 4
$formEntryEditor.ShowInTaskbar = $False
$formEntryEditor.Text = "Einträge bearbeiten"  
$formEntryEditor.add_Load($handler_formEntryEditor_Load)
$formEntryEditor.add_FormClosed($handler_formEntryEditor_FormClosed)

$btnSort.Anchor = 9

$btnSort.DataBindings.DefaultDataSourceUpdateMode = 0

$System_Drawing_Point = New-Object System.Drawing.Point
$System_Drawing_Point.X = 244
$System_Drawing_Point.Y = 227
$btnSort.Location = $System_Drawing_Point
$btnSort.Name = "btnSort"  
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 23
$System_Drawing_Size.Width = 75
$btnSort.Size = $System_Drawing_Size
$btnSort.TabIndex = 11
$btnSort.Text = "A-Z"  
$btnSort.UseVisualStyleBackColor = $True
$btnSort.add_Click($handler_btnSort_Click)

$formEntryEditor.Controls.Add($btnSort)

$btnToBottom.Anchor = 9

$btnToBottom.DataBindings.DefaultDataSourceUpdateMode = 0

$System_Drawing_Point = New-Object System.Drawing.Point
$System_Drawing_Point.X = 244
$System_Drawing_Point.Y = 175
$btnToBottom.Location = $System_Drawing_Point
$btnToBottom.Name = "btnToBottom"  
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 23
$System_Drawing_Size.Width = 75
$btnToBottom.Size = $System_Drawing_Size
$btnToBottom.TabIndex = 10
$btnToBottom.Text = "Nach unten"  
$btnToBottom.UseVisualStyleBackColor = $True
$btnToBottom.add_Click($btnToBottom_OnClick)

$formEntryEditor.Controls.Add($btnToBottom)

$btnToTop.Anchor = 9

$btnToTop.DataBindings.DefaultDataSourceUpdateMode = 0

$System_Drawing_Point = New-Object System.Drawing.Point
$System_Drawing_Point.X = 244
$System_Drawing_Point.Y = 88
$btnToTop.Location = $System_Drawing_Point
$btnToTop.Name = "btnToTop"  
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 23
$System_Drawing_Size.Width = 75
$btnToTop.Size = $System_Drawing_Size
$btnToTop.TabIndex = 9
$btnToTop.Text = "Nach oben"  
$btnToTop.UseVisualStyleBackColor = $True
$btnToTop.add_Click($btnToTop_OnClick)

$formEntryEditor.Controls.Add($btnToTop)

$btnRemove.Anchor = 9

$btnRemove.DataBindings.DefaultDataSourceUpdateMode = 0

$System_Drawing_Point = New-Object System.Drawing.Point
$System_Drawing_Point.X = 244
$System_Drawing_Point.Y = 39
$btnRemove.Location = $System_Drawing_Point
$btnRemove.Name = "btnRemove"  
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 23
$System_Drawing_Size.Width = 75
$btnRemove.Size = $System_Drawing_Size
$btnRemove.TabIndex = 8
$btnRemove.Text = "Entfernen"  
$btnRemove.UseVisualStyleBackColor = $True
$btnRemove.add_Click($handler_btnRemove_Click)

$formEntryEditor.Controls.Add($btnRemove)

$btnAdd.Anchor = 9

$btnAdd.DataBindings.DefaultDataSourceUpdateMode = 0

$System_Drawing_Point = New-Object System.Drawing.Point
$System_Drawing_Point.X = 244
$System_Drawing_Point.Y = 10
$btnAdd.Location = $System_Drawing_Point
$btnAdd.Name = "btnAdd"  
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 23
$System_Drawing_Size.Width = 75
$btnAdd.Size = $System_Drawing_Size
$btnAdd.TabIndex = 7
$btnAdd.Text = "Hinzufügen"  
$btnAdd.UseVisualStyleBackColor = $True
$btnAdd.add_Click($handler_btnAdd_Click)

$formEntryEditor.Controls.Add($btnAdd)

$txtAdd.Anchor = 13
$txtAdd.DataBindings.DefaultDataSourceUpdateMode = 0
$System_Drawing_Point = New-Object System.Drawing.Point
$System_Drawing_Point.X = 12
$System_Drawing_Point.Y = 12
$txtAdd.Location = $System_Drawing_Point
$txtAdd.Name = "txtAdd"  
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 20
$System_Drawing_Size.Width = 226
$txtAdd.Size = $System_Drawing_Size
$txtAdd.TabIndex = 6
$txtAdd.add_KeyDown($handler_txtAdd_KeyDown)

$formEntryEditor.Controls.Add($txtAdd)

$btnCancel.Anchor = 10

$btnCancel.DataBindings.DefaultDataSourceUpdateMode = 0
$btnCancel.DialogResult = 2

$System_Drawing_Point = New-Object System.Drawing.Point
$System_Drawing_Point.X = 210
$System_Drawing_Point.Y = 265
$btnCancel.Location = $System_Drawing_Point
$btnCancel.Name = "btnCancel"  
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 23
$System_Drawing_Size.Width = 109
$btnCancel.Size = $System_Drawing_Size
$btnCancel.TabIndex = 4
$btnCancel.Text = "Abbrechen"  
$btnCancel.UseVisualStyleBackColor = $True
$btnCancel.add_Click($handler_btnCancel_Click)

$formEntryEditor.Controls.Add($btnCancel)

$btnSave.Anchor = 10

$btnSave.DataBindings.DefaultDataSourceUpdateMode = 0
$btnSave.DialogResult = 1

$System_Drawing_Point = New-Object System.Drawing.Point
$System_Drawing_Point.X = 88
$System_Drawing_Point.Y = 265
$btnSave.Location = $System_Drawing_Point
$btnSave.Name = "btnSave"  
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 23
$System_Drawing_Size.Width = 116
$btnSave.Size = $System_Drawing_Size
$btnSave.TabIndex = 3
$btnSave.Text = "Speichern"  
$btnSave.UseVisualStyleBackColor = $True
$btnSave.add_Click($handler_btnSave_Click)

$formEntryEditor.Controls.Add($btnSave)

$btnDown.Anchor = 9

$btnDown.DataBindings.DefaultDataSourceUpdateMode = 0
$btnDown.Font = New-Object System.Drawing.Font("Microsoft Sans Serif",9.75,0,3,1)  

$System_Drawing_Point = New-Object System.Drawing.Point
$System_Drawing_Point.X = 244
$System_Drawing_Point.Y = 146
$btnDown.Location = $System_Drawing_Point
$btnDown.Name = "btnDown"  
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 23
$System_Drawing_Size.Width = 75
$btnDown.Size = $System_Drawing_Size
$btnDown.TabIndex = 2
$btnDown.Text = "˅"  
$btnDown.UseVisualStyleBackColor = $True
$btnDown.add_Click($handler_btnDown_Click)

$formEntryEditor.Controls.Add($btnDown)

$btnUp.Anchor = 9

$btnUp.DataBindings.DefaultDataSourceUpdateMode = 0
$btnUp.Font = New-Object System.Drawing.Font("Microsoft Sans Serif",9.75,0,3,1)  

$System_Drawing_Point = New-Object System.Drawing.Point
$System_Drawing_Point.X = 244
$System_Drawing_Point.Y = 117
$btnUp.Location = $System_Drawing_Point
$btnUp.Name = "btnUp"  
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 23
$System_Drawing_Size.Width = 75
$btnUp.Size = $System_Drawing_Size
$btnUp.TabIndex = 1
$btnUp.Text = "˄"  
$btnUp.UseVisualStyleBackColor = $True
$btnUp.add_Click($handler_btnUp_Click)

$formEntryEditor.Controls.Add($btnUp)

$lbItems.Anchor = 15
$lbItems.DataBindings.DefaultDataSourceUpdateMode = 0
$lbItems.FormattingEnabled = $True
$System_Drawing_Point = New-Object System.Drawing.Point
$System_Drawing_Point.X = 12
$System_Drawing_Point.Y = 38
$lbItems.Location = $System_Drawing_Point
$lbItems.Name = "lbItems"  
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 212
$System_Drawing_Size.Width = 226
$lbItems.Size = $System_Drawing_Size
$lbItems.TabIndex = 0
$lbItems.add_SelectedIndexChanged($handler_lbItems_SelectedIndexChanged)
$lbItems.add_KeyUp($handler_lbItems_KeyUp)

$formEntryEditor.Controls.Add($lbItems)

#endregion Generated Form Code

#Save the initial state of the form
$InitialFormWindowState = $formEntryEditor.WindowState
#Init the OnLoad event to correct the initial state of the form
$formEntryEditor.add_Load($OnLoadForm_StateCorrection)
#Show the Form
$formEntryEditor.ShowDialog()| Out-Null
}
FormEntryEditor