jQuery Grid Plugin - jqGrid

I'm using the jqgrid with editform but I want to add a textbox and a link image in the same option, it´s possible??

I mean when I'm editing the selected row I want to display a textbox to write the value and a image that when I click on this, display a popup menu that let me choose some default values for this box.

colModel: [
                            { name: 'Id', index: 'Id', width: 60,hidden:true, align: 'left', editable:false },
                            { name: 'Concepto', index: 'Concepto', width: 50, align: 'left', editable:true, edittype: "select"},
                            { name: 'Descripcion', index: 'Descripcion', width: 90, align: 'left', editable:true, editoptions:{size:10}, editrules: { required: true }},                          
                            { name: 'Cant', index: 'Cant', width: 10, align: 'right', editable:true, editoptions:{size:10}, editrules: { required: true, minValue: 0, number: true } },
                            { name: 'Vlr_unit', index: 'Vlr_unit', width: 18, align: 'right', editable:true, editoptions:{size:10, image+onclick event }, editrules: { required: true, minValue: 0, number: true  } },
                            { name: 'Vlr_parc', index: 'Vlr_parc', width: 20, align: 'right', editable:false, editoptions:{size:10} },
                         ],

I have resalted the piece of code that I'm interested in. Any help will be very appreciate

Thanks in advance...