[Seating Chart] - Changing size of Viewbox while dragging

I know this block of code for size of guest rectangle

      $(go.Panel, "Viewbox",
        { desiredSize: new go.Size(50, 38) },
        $(go.TextBlock, { margin: 2, desiredSize: new go.Size(55, NaN), font: "8pt Verdana, sans-serif", textAlign: "center", stroke: "darkblue" },
          new go.Binding("text", "", function(data) {
            var s = data.key;
            if (data.plus) s += " +" + data.plus.toString();
            return s;

I want to change size of guest once drag to another canvas (main diagram) and back to original size if drag back to canvas of guest.
Thanks in advanced.

What size do you want the text to be? You could remove the “Viewbox” Panel from around the TextBlock and set its desiredSize.

Dear @walter,
I want it to be smaller, circle and fit to a seat. However still be big size if drag drop in left side (canvas).

Is there a reason you cannot modify the code to specify a smaller desiredSize?

Dear @walter,
I don’t know where event of drawing worker in right canvas is.
My purpose is just changing size of worker once dragging to right side canvas, not for all of situations.

Have you tried changing the Diagram.scale of the Palette?

Dear @walter,
Not yet, I’ll try this.
Could you give me reference of this?