Public/Clear-WPFRichTextBox.ps1

function Clear-WPFRichTextBox
{
<#
    .SYNOPSIS
        This function will clear the content of a richtextbox control
     
    .DESCRIPTION
        This function will clear the content of a richtextbox control
     
    .PARAMETER RichTextBox
        Specifies the RichTextBox control
     
    .EXAMPLE
        Clear-WPFRichTextBox -RichTextBox $RichTextBox1
     
    .NOTES
        Francois-Xavier Cat
        @lazywinadm
        www.lazywinadmin.com
        github.com/lazywinadmin
#>

    
    [CmdletBinding(SupportsShouldProcess = $true)]
    param
    (
        [Parameter(Mandatory = $true)]
        [ValidateNotNull()]
        [System.Windows.Controls.RichTextBox]$RichTextBox
    )
    
    BEGIN
    {
        Add-Type �assemblyName PresentationFramework
        Add-Type �assemblyName PresentationCore
        Add-Type �assemblyName WindowsBase
    }
    PROCESS
    {
        IF ($PSCmdlet.ShouldProcess($RichTextBox, "Clear the Richtextbox control"))
        {
            #Clear the RichTextBox
            $RichTextBox.Document.Blocks.Clear()
        }
    }
}