vb.net - Unable to select more than 1 radio button -

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i have 4 radio buttons, r1, r2, r3, r4. these 4 radio buttons in group box.

r1 , r2 asking gender of person.

r1 male , r2 female

r3 , r4 asking whether user continue.

r3 yes , r4 no.

when click r1 , r3 becomes unchecked , vice versa. similar case r2 , r4. @ time can check 1 radio button. how can around problem . groupbox essential cannot remove it.

radiobuttons grouped parent-control. sufficient re-group them in panel.

current layout:

groupbox     radiobutton     radiobutton     radiobutton     radiobutton

new layout:

groupbox     panel         radiobutton         radiobutton     panel         radiobutton         radiobutton

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