New-UDMenu [[-ClassName] ], not typed correctly?!

Hello nickzohren,

Thank you for reporting this behavior.

To help us determine whether `New-UDMenu -ClassName` is not being applied correctly or is targeting a different HTML element than expected, could you please provide:

* Your exact PowerShell Universal version and build.
* A minimal reproducible example containing the `New-UDMenu`, the CSS class definition, and one component where the same class works correctly.
* The expected result and the actual result.
* Confirmation of whether the class appears anywhere on the menu element or its parent container when inspected using the browser developer tools.
* A screenshot of the relevant DOM element and computed CSS rules, if available.

This will allow us to compare the behavior under the same conditions and determine whether the issue is functional, related to CSS specificity, or limited to the parameter description.

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Best regards,
Ruben Tapia

Hi Ruben Tapia,

Thank you for your response. We just upgraded to 2026.2.3 previously we were on version 5.6.12 , altough i only noticed this behaviour after the upgrade since we did not use the menu component before.

function New-CategoryBar {
    [CmdletBinding()]
    param(
        $NavIndex = $Session:DashboardNavIndex,
        [string[]] $Roles,
        [string]   $ActiveCategory
    )
 
    $categories = @(Get-AccessibleCategories -NavIndex $NavIndex -Roles $Roles)

    New-UDElement -Tag 'div' -Id 'category-bar' -Content ({

            foreach ($category in $categories) {
                $className = ($category.Key -eq $ActiveCategory) ? 'category-button active' : 'category-button'

                <#New-UDButton -ClassName $className `
                    -Text $category.Label `
                    -Icon (New-UDIcon -Icon $category.Icon) `
                    -OnClick ([scriptblock]::Create("Invoke-UDRedirect -Url '$($category.DefaultUrl)'"))#>

                New-UDElement -Tag 'div' -ClassName $className -Content {
                    New-UDMenu -Icon (New-UDIcon -Icon $category.Icon) -Text $category.Label -Children {
                        foreach ($pageKey in $category.Pagekeys) {
                            $page = $NavIndex.Pages[$pageKey]
                            New-UDMenuItem -Text $page.Title `
                                -Icon (New-UDIcon -Icon $page.Icon -Size lg) `
                                -OnClick ([scriptblock]::Create("Invoke-UDRedirect -Url '$($page.Url)'"))
                        }
                    }
                }
            }
            
        }.GetNewClosure())
}

For Context i inclued the custom component function, nut just the snippet of the New-UDMenu. This shows both the current workaround by adding a wrapper around the New-UDMenu component aswell as the previous implementation using the New-UDButton. In the css codeblock below i am also targeting the MuiButton-root to style the UDMenu components button, which would not be nessesary if t he .category-button class could be added using the -ClassName parameter directly.

.category-button {
  &>.MuiButton-root {
    font-size: medium;
    font-weight: 400;
    color: var(--esh-teal-soft);
    height: 100%;
    width: calc(5*var(--category-bar-h));
    margin: 0px -6px !important;
    padding: var(--category-margin) 30px 0px;
    border-radius: 0;
    clip-path: shape(from bottom left,
        line to calc(var(--category-slant) - var(--category-radius) / 2) calc(var(--category-radius) + var(--category-margin)),
        curve to calc(var(--category-slant) + var(--category-radius) / 2) var(--category-margin) with var(--category-slant) var(--category-margin),
        hline to calc(100% - var(--category-slant) - var(--category-radius) / 2),
        curve to calc(100% - var(--category-slant) + var(--category-radius) / 2) calc(var(--category-radius) + var(--category-margin)) with calc(100% - var(--category-slant)) var(--category-margin),
        line to 100% 100%);
  }

  &.active>.MuiButton-root {
    background-color: var(--esh-surface);
    color: var(--esh-text);
    font-weight: bold;
    z-index: 1100;
  }
}

I would expect the -ClassName parameter to function just like other components (in my example New-UDButton) and add the CSS class name of type [string] to the html element.

As for your other requests about the DOM Element and the confirmation about the class appearing on the element. The since the -ClassName is of type [ParameterAttribute], meaning its type is not set correctly or not at all. For example [Parameter]$ClassName instead of [Parameter()][string]$ClassName could cause this. Since setting this parameter of this type is impossible the entire function fails and my apps New-AppHeader including the New-CategoryBar is not rendered in the DOM at all.

In my example code adding -Classname $className to the New-UDMenu component will result in this error and the enitre component to not render.

i hope this clears up the issue and this should be VERY easily reproducible by just adding anything to New-UDMenu -ClassName since it will result in a exception.
I do hope this is helpfull.

regards,
Nick