Add assert to ControlOK to test that a parent HWND exists
Add assert to ControlOK to test that a parent HWND exists

modulexcite/UIforETW,modulexcite/UIforETW,google/UIforETW,ariccio/UIforETW,ariccio/UIforETW,u-engine/UIforETW,OSVR/UIforETW,OSVR/UIforETW,mwinterb/UIforETW,mwinterb/UIforETW,OSVR/UIforETW,ariccio/UIforETW,MikeMarcin/UIforETW,mwinterb/UIforETW,google/UIforETW,ariccio/UIforETW,google/UIforETW,u-engine/UIforETW,u-engine/UIforETW,google/UIforETW,modulexcite/UIforETW,MikeMarcin/UIforETW,MikeMarcin/UIforETW