How do you set a two-state button as "checked" in program code? For example, in the following Telerik example how do you set as checked the button having ImageUrl="~/Images/J.gif" ?
<telerik:RadToolBar ID="RadToolBar1" runat="server" Skin="Hay" >
<Items>
<telerik:RadToolBarButton
runat="server"
ImageUrl="~/Images/bold.gif"
AllowSelfUnCheck="True"
CheckOnClick="True" />
<telerik:RadToolBarButton
runat="server"
ImageUrl="~/Images/Italic.gif"
AllowSelfUnCheck="True"
CheckOnClick="True" />
<telerik:RadToolBarButton
runat="server"
ImageUrl="~/Images/underline.gif"
AllowSelfUnCheck="True"
CheckOnClick="True" />
<telerik:RadToolBarButton
runat="server"
Enabled="False"
Text="|" />
<telerik:RadToolBarButton
runat="server"
Checked="True"
CheckOnClick="True"
Group="Justify"
ImageUrl="~/Images/LJ.gif" />
<telerik:RadToolBarButton
runat="server"
CheckOnClick="True"
Group="Justify"
ImageUrl="~/Images/J.gif" />
<telerik:RadToolBarButton
runat="server"
CheckOnClick="True"
ImageUrl="~/Images/RJ.gif" />
</Items>
</telerik:RadToolBar>
<Items>
<telerik:RadToolBarButton
runat="server"
ImageUrl="~/Images/bold.gif"
AllowSelfUnCheck="True"
CheckOnClick="True" />
<telerik:RadToolBarButton
runat="server"
ImageUrl="~/Images/Italic.gif"
AllowSelfUnCheck="True"
CheckOnClick="True" />
<telerik:RadToolBarButton
runat="server"
ImageUrl="~/Images/underline.gif"
AllowSelfUnCheck="True"
CheckOnClick="True" />
<telerik:RadToolBarButton
runat="server"
Enabled="False"
Text="|" />
<telerik:RadToolBarButton
runat="server"
Checked="True"
CheckOnClick="True"
Group="Justify"
ImageUrl="~/Images/LJ.gif" />
<telerik:RadToolBarButton
runat="server"
CheckOnClick="True"
Group="Justify"
ImageUrl="~/Images/J.gif" />
<telerik:RadToolBarButton
runat="server"
CheckOnClick="True"
ImageUrl="~/Images/RJ.gif" />
</Items>
</telerik:RadToolBar>