How can I detect when a figure's colormap is changed?

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Julian
Julian 2013-12-6
The most obvious way to change a figure's colormap is via the Edit/Colormap... menu, although controls such as those added with lutbar are even handier.
How can I detect when the colormap of a figure is changed? Ideally I would even detect programmatic changes such as
set(gcf, 'Colormap', lines)
although this is not essential.
Other figures contain plots coloured coded to an image shown in the main figure, and I need to cascade any changes to the colormap.

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