about calling a control outside of the class

Question

I am working on a windows app. There is a menubar on main interface and on the main interface there is a panel. On click event of "View Calender" there is a onother form on the panel. On that form there is a monthcalender. I want to show current date bolded on click event of "Jump to Today" menu item.  Please help me. Thanx in advance.