OldThink/Content.Client/Administration/UI/CustomControls/PlayerListControl.xaml

<BoxContainer xmlns="https://spacestation14.io"
              xmlns:controls="using:Content.Client.UserInterface.Controls"
              Orientation="Vertical">
    <Control MinSize="0 5" />
    <LineEdit Name="FilterLineEdit"
              MinSize="100 0"
              HorizontalExpand="True"
              PlaceHolder="{Loc Filter}"/>
    <PanelContainer Name="BackgroundPanel"
                    VerticalExpand="True"
                    HorizontalExpand="True">
        <controls:ListContainer Name="PlayerListContainer"
                  Access="Public"
                  Toggle="True"
                  Group="True"
                  MinSize="100 0"/>
    </PanelContainer>
</BoxContainer>