Connecting Switches to Hidden Supply Pins in Proteus ISIS
Go to Design from menu toolbar then choose configure power rails.
You will see two textarea unconnected power nets and they have the name of &lt; my net name >
first choose from name dropdown menu the right voltage VCC or GND, then highlight &lt; my net name > and last click add, repeat the step 3 if there is more one.
click ok then save and every thing is ok.