winutil/functions/public/Invoke-WPFTab.ps1

function Invoke-WPFTab {

    <#

    .SYNOPSIS
        Sets the selected tab to the tab that was clicked

    .PARAMETER ClickedTab
        The name of the tab that was clicked

    #>

    Param (
        [Parameter(Mandatory,position=0)]
        [string]$ClickedTab
    )

    $tabNav = Get-WinUtilVariables | Where-Object {$psitem -like "WPFTabNav"}
    $tabNumber = [int]($ClickedTab -replace "WPFTab","" -replace "BT","") - 1

    $filter = Get-WinUtilVariables -Type ToggleButton | Where-Object {$psitem -like "WPFTab?BT"}
    ($sync.GetEnumerator()).where{$psitem.Key -in $filter} | ForEach-Object {
        if ($ClickedTab -ne $PSItem.name) {
            $sync[$PSItem.Name].IsChecked = $false
            # $tabNumber = [int]($PSItem.Name -replace "WPFTab","" -replace "BT","") - 1
            # $sync.$tabNav.Items[$tabNumber].IsSelected = $false
        } else {
            $sync["$ClickedTab"].IsChecked = $true
            $tabNumber = [int]($ClickedTab-replace "WPFTab","" -replace "BT","") - 1
            $sync.$tabNav.Items[$tabNumber].IsSelected = $true
        }
    }
}