NodePanelSizing

The NodePanel is automatically sized to fit all of its children. Basically, the first child (presumably a convex shape) will surround the second child, which in simple nodes is typically a TextBlock, but could be a more complicated element. If the child is a TextBlock with text wrapping set to true, it will be appropriately wrapped so that all of its text is visible.

The NodePanel takes the size of its first child. All other elements are placed within the bounds defined by the NodePanel.Spot1 and NodePanel.Spot2 properties of that first child.