[rkorchagin]

вот такое решение...
WebFormHTML -> layoutCheckBox

// [AGR6988]CUS-Modification on 28.03.2007 by TE-rko added - start
    if (this.controlName(fwcb) == 'AGR_EPFarmerRegisteredUsers_InvoicePaym')
        #Output(' onclick="InvoicePaym_OnClick()"');
// [AGR6988]CUS-Modification on 28.03.2007 by TE-rko added - end

    if (fwcb.value())
        #Output(' checked=true ');
    #Output(' VALUE=ON ');

    [allowedit,mandatory,enabled] = this.getInputModifiers(fwcb);

    if ((allowedit == FALSE) ||
        (enabled == FALSE))
        #Output(' style="border: 0" DISABLED ');


    #Output('></td>\n');

// [AGR6988]CUS-Modification on 28.03.2007 by TE-rko added - start
 if (this.controlName(fwcb) == 'AGR_EPFarmerRegisteredUsers_InvoicePaym')
 {
    #Output('<SCRIPT LANGUAGE=javascript>\n');
    #Output('function InvoicePaym_OnClick()\n');
    #Output('{\n');
    #Output('if (document.AGR_EPFarmerUserRegistration.AGR_EPFarmerRegisteredUsers_InvoicePaym.checked == false)\n');
    #Output('  { document.AGR_EPFarmerUserRegistration.AgrHomeShopId.value = 1;\n');
    #Output('    document.AGR_EPFarmerUserRegistration.AgrHomeShopId.disabled = true; }\n');
    #Output('else\n');
    #Output(' {  document.AGR_EPFarmerUserRegistration.AgrHomeShopId.disabled = false;}\n');
    #Output('}\n');
    #Output('</SCRIPT>\n');
 }
// [AGR6988]CUS-Modification on 28.03.2007 by TE-rko added - end