<｜begin▁of▁sentence｜>### Instruction:
As a technical illustrator creating technical drawings for a network visualization software, I need to implement a custom graph drawer class that extends AbstractGraphDrawer in igraph to ensure a layout for the graph. This graph should have 10 nodes, each with 2 children, forming a tree structure. I also need to prepare a method for drawing the graph, using the 'fr' (Fruchterman-Reingold) layout if no specific layout is provided. This will help in visually representing the network structure for documentation purposes.
### Response:
from igraph import Graph, plot

class CustomGraphDrawer(AbstractGraphDrawer):
    def __init__(self, graph, layout='auto'):
        self.graph = graph
        self.layout = self.ensure_layout(layout, graph)

    def draw(self, context):
        # Custom drawing logic goes here
        pass

# Usage example:
g = Graph.Tree(10, 2)
p = plot(g, CustomGraphDrawer(g, 'fr'))
<|EOT|>
