Initiate the 'AT selection-screen' EVENT from radiobuttons

In-order for the Radiobutton selection process to initiate the 'AT selection-screen' event you need to
add the 'USER_COMMAND' option to the parameter declaration. See code below.

*Code used to Initiate the 'AT selection-screen' EVENT from radiobuttons.
selection-screen begin of block group with frame title text-s04.
parameters: p_sel1 type c radiobutton group sel user-command upd.
parameters: p_sel2 type c radiobutton group sel.
parameters: p_sel3 type c radiobutton group sel.
selection-screen end of block group.

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