<｜begin▁of▁sentence｜>### Instruction:
Given a tree graph with 10 vertices (where each vertex has 2 children) that you want to render and save as a PNG image, how would you use the CairoPlot class to create this plot with a 'rainbow' color palette on a white background and with the title 'My Tree Graph'?
### Response:
from igraph import Graph, plot
import igraph.drawing.colors

# Create a graph
g = Graph.Tree(10, 2)

# Define a CairoPlot object with given dimensions
pl = plot.CairoPlot(g, bbox=(300, 300), palette='rainbow', background='white')

# Add a title to the plot (using *args for demonstration)
pl.add(g, *('title',), title='My Tree Graph')

# Save plot to a PNG file
pl.save('my_tree_graph.png')
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