I need add element in a Panel with a button

@puiggali wrote:

Can someone help me please?

myDiagram.nodeTemplate =
  $(go.Node, "Auto",  // the whole node panel
    { selectionAdorned: true,
      resizable: true,
      layoutConditions: go.Part.LayoutStandard & ~go.Part.LayoutNodeSized,
      fromSpot: go.Spot.AllSides,
      toSpot: go.Spot.AllSides,
      isShadowed: true,
      shadowColor: "#C5C1AA",

        fromLinkable: true,
        fromLinkableSelfNode: true,
        fromLinkableDuplicates: true,
        toLinkable: true,
        toLinkableSelfNode: true,
        toLinkableDuplicates: true,
        cursor: "pointer"

       },
    new go.Binding("location", "location").makeTwoWay(),
    // define the node's outer shape, which will surround the Table
    $(go.Shape, "Rectangle",
      { fill: lightgrad, stroke: "#756875", strokeWidth: 3 }),
    $(go.Panel, "Table",
      { margin: 8, stretch: go.GraphObject.Fill },
      $(go.RowColumnDefinition, { row: 0, sizing: go.RowColumnDefinition.None }),
      // the table header
      $(go.TextBlock,
        {
          row: 0, alignment: go.Spot.Center,
          margin: new go.Margin(0, 14, 0, 2),  // leave room for Button
          font: "bold 16px sans-serif",
          editable: true, isMultiline: false
        },
        new go.Binding("text", "key").makeTwoWay()),
        new go.Binding("segmentOffset", "segmentOffset", go.Point.parse).makeTwoWay(go.Point.stringify), //Actualitza automaticament les dades al codi
      // the collapse/expand button
      $("PanelExpanderButton", "LIST",  // the name of the element whose visibility this button toggles
        { row: 0, alignment: go.Spot.TopRight }),
      // the list of Panels, each showing an attribute
      $(go.Panel, "Vertical",
        {
          name: "LIST",
          row: 1,
          padding: 3,
          alignment: go.Spot.TopLeft,
          defaultAlignment: go.Spot.Left,
          stretch: go.GraphObject.Horizontal,
          itemTemplate: itemTempl
        },
        new go.Binding("itemArray", "items")),

      { // this tooltip Adornment is shared by all nodes
      toolTip:
        $(go.Adornment, "Auto",
          $(go.Shape, { fill: "#FFFFCC" }),
          $(go.TextBlock, { margin: 4 },  // the tooltip shows the result of calling nodeInfo(data)
            new go.Binding("text", "", nodeInfo))
        ),
      // this context menu Adornment is shared by all nodes
      contextMenu: partContextMenu
    }

    )  // end Table Panel

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