How to make ext.net RadioGroup a required field? -

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we using ext.net. know how make textbox required field, having trouble force our user make selection on radio group or check box group. know assign default value 1 of radio button, our customer wants leave them unchecked in beginning forces web users make choice, understandable.

it appears indicatortext , allowblank properties not effective though listed in intellisense.

<ext:radiogroup id="rdgrpgender" runat="server"        itemcls="x-check-group-base" fieldlabel="gender"       columnswidths="60,60"        indicatortext="*" indicatorcls="cssindicator" allowblank="false">       <items>           <ext:radio id="rdomale" runat="server" boxlabel="m" />           <ext:radio id="rdofemale" runat="server" boxlabel="f" />       </items> </ext:radiogroup>

can expert me out? lot.

you can validate this

    <ext:button id="button1" runat="server" text="validate"><listeners><click handler="#{rdgrpgender}.validate();" /></listeners></ext:button>

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