I use Lock and Filter at the same time.
when only use GridFilters,it's ok.
<Features>
    <ext:GridFilters>
        <Filters>
            <ext:StringFilter DataIndex="ID">
            </ext:StringFilter>
        </Filters>
    </ext:GridFilters>
</Features>
But after I set the column's lock = false,there're two questions,
one is the column's Filters menu was not shown, the other is the column can not be edit.
<ext:ComponentColumn ID="ComponentColumn1" runat="server" Editor="true" DataIndex="ID" Text="ID" Locked="false">
         <Component>
                <ext:TextField ID="TextField1" runat="server" ReadOnly="false" />
         </Component>
 </ext:ComponentColumn>
Why unLocked column can not be filtered and edit?