Regarding New Features adding to SambaPOS

I tried to make changes

  1. we are managing all setting in MANAGE tab and internally we are making many clicks in order to add any catagory and any table etc…

So i just want to keep all those functionalitys as a shortcut in POS module on tables list i added one more Field like “+(plus) button” so if we click on that we need to allow user to add a table/Customer from here itself…(look below url contain Image of my Idea)

What i tried is i just kept a button as “+” and code behind given reference to already existing code other pages, But we unable to get it. it throwing NULL exception and i understand that the classes are not initialized but we are trying to use that and if we initalize those methods also we are getting issue while click operation performed as null exception

Please sugest me how to achieve this shortcut button operation in SambaPos