I'm not sure what a "docapp" is, but if it's anything like gkrellm, you can start it in your .xinitrc file before fluxbox is called, and with a "&" after it.
I have gkrellm startup in the slit whenever I start flux, and this is what I have in $HOME/.xinitrc:
exec /usr/local/bin/gkrellm -w &
exec fluxbox
I hope that helps
good luck
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