How to detect drop on elements on one level down

@Rajeshpatil74 wrote:

I have a diagram as shown in Fig.

BPMN.png999x720 50.2 KB

When decorative element is added in the diagram and then user tries to do drag -drop of "Task" & "Gateway"
the mousedrop event doesn't get raised for the group elements (which are below the decorative element)

How one can achieve same ?
For decorative node the template is defined as below -

> BPMNMileStoneDiagramManager.prototype.getShapeNodeTemplate = function () {
>     var current = this;
>     var palscale = 1;
>     var nodeTemplate =
>         current.goObj(go.Node, "Auto",
>             { selectionAdorned: true, resizable: true, zOrder: -1, layerName : "decoration" },
>             new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
>             new go.Binding("desiredSize", "size", go.Size.parse).makeTwoWay(go.Size.stringify),
>             new go.Binding("zOrder", "zOrder"),
>             {
>                 toolTip:
>                   current.goObj(go.Adornment, "Auto",
>                     current.goObj(go.Shape, { fill: "#FFFFCC" }),
>                     current.goObj(go.TextBlock, { margin: 4, text: "Tool Tip text" }, new go.Binding("text", "text").makeTwoWay())
>                     ),

>                 doubleClick: function (e, node) {
>                     var tb = node.findObject("TEXT");
>                     if (tb !== null) {
>                         if (tb.text == "") tb.text = "____";
>                         e.diagram.commandHandler.editTextBlock(tb);
>                     }
>                 }
>             },

>             current.goObj(go.Shape,
>                 { fill: "transparent", stroke: "black", strokeWidth: 1, minSize: new go.Size(75, 75) },
>                 new go.Binding("fill", "", current.fillColorConverter.bind(current)),
>                 new go.Binding("stroke", "", current.borderColorConverter.bind(current)),
>                 new go.Binding("strokeDashArray", "strokeDashArray"),
>                 new go.Binding("strokeWidth", "strokeWidth"),
>                 new go.Binding("figure", "figure")),

>             current.goObj(go.TextBlock,
>                 { name: "TEXT", margin: 5, editable: true },
>                 new go.Binding("text").makeTwoWay(),
>                 new go.Binding("font", "font"),
>                 new go.Binding("stroke", "", current.textColorConverter.bind(current)),
>                 new go.Binding("alignment", "textAlign", go.Spot.parse)
>                 )
>         );
>     return nodeTemplate;
> }

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