Alignment of items inside of HeaderTemplate of RadzenPanel

I've specified a custom header-template for a RadzenPanel-component. I want some items to align on the left side and other one on the right side of that panel header.

I found an similiar question here (https://forum.radzen.com/t/how-to-have-a-header-with-some-content-aligned-left-and-some-aligned-right/16284) but the solution offered there only works for headers but not for the header of an panel.

Any ideas how to solve that issue?

Update: Following my actual source code which isn't working:

<RadzenPanel AllowCollapse="true" ><HeaderTemplate><RadzenRow AlignItems="AlignItems.Center" JustifyContent="JustifyContent.Start" Gap="1px" Style="width: stretch; background-color:orange"><RadzenColumn ><RadzenStack Orientation="Orientation.Horizontal" AlignItems="AlignItems.Center" JustifyContent="JustifyContent.Start"><RadzenText>This to the left</RadzenText></RadzenStack></RadzenColumn><RadzenColumn><RadzenStack Orientation="Orientation.Horizontal" AlignItems="AlignItems.Center" JustifyContent="JustifyContent.End"><RadzenText>This to the right</RadzenText></RadzenStack></RadzenColumn></RadzenRow></HeaderTemplate><ChildContent><RadzenText>Content</RadzenText></ChildContent></RadzenPanel>