How to align TreeExpanderButton at the end of text in the node

GoJS
#1

I have created a GoJS tree and added some nodes in it. All the nodes have TreeExpanderButton with them, but the issue is that TreeExpanderButton is overlapping the text of the node. How can I make this look fine?

The code I am using is :
$("TreeExpanderButton", { alignment: go.Spot.Right, alignmentFocus: go.Spot.Left }, { visible: true })

#2

I fixed this by this code:

$(go.TextBlock, { margin: new go.Margin(10, 15, 10, 10) },