Hi Avinash
To do a right click you only need to spy the element you need to press then using a navigate stage set the element to focus. Add a second step in the navigate under the focus and add the root application element to this then select Global mouse click or Global mouse click center, in the mouse button options enter "RIGHT". This should work to right click the button for you.
Out of curiosity can I ask why you need to do a right click on a checkbox item?
Hope this helps
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Michael ONeil
Technical Lead developer
Everis Consultancy
Europe/London
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#MVP