Connecting capacitor to logic gates/flip flop

Hi, I am working on SimPowerSystems on Simulink and I constructed a dc-dc converter using the PowerElectronics toolbox. Now, my control circuit design for the converter has SR flipflop and AND/OR gates which, beside the digital elements, also needs capacitors for voltage hold up purposes.

I am unable to connect, say a capacitor (taken from Simscape->Electrical section or from Sim PowerSytems)to the input/output of logic gates (taken from the Logic and Bit Operations section) or to the input/output of two-way switch (taken from Signal Routing section). Please advise about how to construct a realistic control circuit using Simulink where digital and analog components can be interfaced with each other.

With Regards,

Anubhav