The nodes in the palette are centered in both horizontal and vertical directions

Hi,How to center the nodes in the palette both horizontally and vertically when there is only one node in the palette,

                $(go.Group, "Auto",
                        name: "Groups",
                        background: "transparent",
                        computesBoundsAfterDrag: true,

                        layout: $(go.GridLayout,
                                alignment: go.GridLayout.Position,
                                wrappingColumn: 5,
                                cellSize: new go.Size(1, 1),
                                spacing: new go.Size(4, 4)
                    $(go.Shape, "Rectangle",
                            fill: null,
                            stroke: "#ff913a",
                            strokeWidth: 2,
                            cursor: "pointer",
                            portId: "",
                            fromLinkable: true,
                            toLinkable: true,
                            fromLinkableSelfNode: true,
                            toLinkableSelfNode: true,
                            fromLinkableDuplicates: true,
                            toLinkableDuplicates: true

                    $(go.Panel, "Vertical",
                            name: "PanelVertical",
                            minSize: new go.Size(20, 20)

                        new go.Binding("minSize", "minSize").makeTwoWay(),
                            $(go.Panel, "Horizontal",
                                stretch: go.GraphObject.Horizontal,
                                background: "red"
                                    alignment: go.Spot.Left,
                                    margin: 5,
                                    isMultiline: false,
                                    font: "bold 18px sans-serif",
                                    opacity: 0.75,
                                    stroke: "#404040"
                                new go.Binding("text", "text").makeTwoWay(),
                                new go.Binding("font", "font").makeTwoWay()
                        ), // end Horizontal Panel
                        $(go.Placeholder, {padding: 5, alignment: go.Spot.TopLeft})

            myPalette = $(go.Palette, "myPaletteDiv",
                    groupTemplateMap: myDiagram.groupTemplateMap,
                    layout: $(go.GridLayout, {wrappingColumn: 1, alignment: go.GridLayout.Position})

            myPalette.model = new go.GraphLinksModel([
                    key: -1024,
                    nodeType: 4,
                    text: "palette",
                    category: "OfGroups",
                    isGroup: "true",
                    font: "bold 13px sans-serif"


Perhaps you want to set your Palette’s Diagram.contentAlignment to go.Spot.Center?

This is exactly the answer I want, thanks