winutil/functions/public/Initialize-WPFUI.ps1

function Initialize-WPFUI {
    [OutputType([void])]
    param(
        [Parameter(Mandatory)]
        [string]$TargetGridName
    )

    switch ($TargetGridName) {
        "appscategory"{
            # TODO 
            # Switch UI generation of the sidebar to this function
            # $sync.ItemsControl = Initialize-InstallAppArea -TargetElement $TargetGridName
            # ...

            # Create and configure a popup for displaying selected apps
            $selectedAppsPopup = New-Object Windows.Controls.Primitives.Popup
            $selectedAppsPopup.IsOpen = $false
            $selectedAppsPopup.PlacementTarget = $sync.WPFselectedAppsButton
            $selectedAppsPopup.Placement = [System.Windows.Controls.Primitives.PlacementMode]::Bottom
            $selectedAppsPopup.AllowsTransparency = $true

            # Style the popup with a border and background
            $selectedAppsBorder = New-Object Windows.Controls.Border
            $selectedAppsBorder.SetResourceReference([Windows.Controls.Control]::BackgroundProperty, "MainBackgroundColor")
            $selectedAppsBorder.SetResourceReference([Windows.Controls.Control]::BorderBrushProperty, "MainForegroundColor")
            $selectedAppsBorder.SetResourceReference([Windows.Controls.Control]::BorderThicknessProperty, "ButtonBorderThickness")
            $selectedAppsBorder.Width = 200
            $selectedAppsBorder.Padding = 5
            $selectedAppsPopup.Child = $selectedAppsBorder
            $sync.selectedAppsPopup = $selectedAppsPopup

            # Add a stack panel inside the popup's border to organize its child elements
            $sync.selectedAppsstackPanel = New-Object Windows.Controls.StackPanel
            $selectedAppsBorder.Child = $sync.selectedAppsstackPanel

            # Close selectedAppsPopup when mouse leaves both button and selectedAppsPopup
            $sync.WPFselectedAppsButton.Add_MouseLeave({
                if (-not $sync.selectedAppsPopup.IsMouseOver) {
                    $sync.selectedAppsPopup.IsOpen = $false
                }
            })
            $selectedAppsPopup.Add_MouseLeave({
                if (-not $sync.WPFselectedAppsButton.IsMouseOver) {
                    $sync.selectedAppsPopup.IsOpen = $false
                }
            })
        }
        "appspanel" {
            $sync.ItemsControl = Initialize-InstallAppArea -TargetElement $TargetGridName
            Initialize-InstallCategoryAppList -TargetElement $sync.ItemsControl -Apps $sync.configs.applicationsHashtable
        }
        default {
            Write-Output "$TargetGridName not yet implemented"
        }
    }
}