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Set container's Margin property.

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Set these properties to values different than the default ones, e.g. try All and SquareHandles instead -

ContainerNode()
{
	EnabledHandles = AdjustmentHandles.Move;
	HandlesStyle = HandlesStyle.MoveOnly;
} 

Regards,
Slavcho
Mindfusion

Containers are implemented via Group objects, and you can get child nodes / parent container through the SubordinateGroup.AttachedNodes / MasterGroup.MainItem properties. We've started migrating this to dedicated APIs for containers in a few of our platforms (e.g. node.Container), which will be available in WinForms version too later this year, but for time being you'll need to use the groups API. There's also a static ContainerNode.GetContainer(childNode) helper method.

Regards,
Slavcho

try container.SubordinateGroup.AttachedNodes.

Try the diagram.RoundRectFactor property.

You can find nearby grid point by calling diagram.AlignPointToGrid(node.Bounds.Location), and then call node.Move() to move the node to that point.

Why move the ContainerNode's Nodes back to their original places