How do I remove default shortcut on command line

[Lampersperger Andreas]

Hello,

I want a application to receive Ctrl+F1. 

How can I remove this XFCE shortcut on command line? 

When I enter 

xfconf-query -c xfce4-keyboard-shortcuts -p '/xfwm4/default/<Co
ntrol>F1' -r

nothing happens and the Ctrl+F1 still is switching to
workspace 1.

When I enter 

xfconf-query -c xfce4-keyboard-shortcuts -l

I still get

...
/xfwm4/default/<Control>F1
...


Thank you for your help!
Andreas


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