Ext.net combobox 的disabled

this.ComboBox7.Disabled =true;

 <ext:RadioGroup ID="RadioG_sfzg" runat="server" GroupName="RadioGroup" FieldLabel="是否第一<font color=red>*</font>" Cls="x-check-group-alt" Visible="false">

使用的是Visible="false" 这个属性,后台没找到类似的设置 .

  <ext:RadioGroup ID="RadioG" runat="server" GroupName="RadioGroup" FieldLabel="是否第一<font color=red>*</font>" Cls="x-check-group-alt" >
       <Items>
              <ext:Radio ID="Radio1" runat="server" BoxLabel="是" InputValue="1">
                        <DirectEvents>
                                      <Check OnEvent="Radio1_check" />
                         </DirectEvents>
               </ext:Radio>
               <ext:Radio ID="Radio2" runat="server" BoxLabel="否" InputValue="0" Checked="true">
                           <DirectEvents>
                                         <Check OnEvent="Radio2_check" />
                           </DirectEvents>
               </ext:Radio>
        </Items>
   </ext:RadioGroup>

<ext:ComboBox ID="ComboBox7" runat="server" FieldLabel="第一名<font color=red>*</font>" EmptyText="请选择..." TypeAhead="true" ForceSelection="false" Mode="Local" StoreID="Store6" DisplayField="Name" ValueField="Id" MinChars="0" ListWidth="150" AnchorHorizontal="92%" />

        protected void Radio1_check(object sender, DirectEventArgs e){
            if (this.Radio1.Checked)
            {
                this.ComboBox7.Disabled = false;
 
            }
           
        }
        protected void Radio2_check(object sender, DirectEventArgs e)
        {
            if (this.Radio2.Checked)
            {
                this.ComboBox7.Disabled = true;
            }
        }